Merge pull request #2419 from atom/clean-native-window

Clean up NativeWindow code

atom/browser/native_window.cc

@@ -68,6 +68,22 @@ const char* kWebRuntimeFeatures[] = {
   switches::kPageVisibility,
 };
 
+// Convert draggable regions in raw format to SkRegion format. Caller is
+// responsible for deleting the returned SkRegion instance.
+scoped_ptr<SkRegion> DraggableRegionsToSkRegion(
+    const std::vector<DraggableRegion>& regions) {
+  scoped_ptr<SkRegion> sk_region(new SkRegion);
+  for (const DraggableRegion& region : regions) {
+    sk_region->op(
+        region.bounds.x(),
+        region.bounds.y(),
+        region.bounds.right(),
+        region.bounds.bottom(),
+        region.draggable ? SkRegion::kUnion_Op : SkRegion::kDifference_Op);
+  }
+  return sk_region.Pass();
+}
+
 }  // namespace
 
 NativeWindow::NativeWindow(
@@ -506,6 +522,12 @@ void NativeWindow::NotifyWindowLeaveHtmlFullScreen() {
                     OnWindowLeaveHtmlFullScreen());
 }
 
+void NativeWindow::NotifyWindowExecuteWindowsCommand(
+    const std::string& command) {
+  FOR_EACH_OBSERVER(NativeWindowObserver, observers_,
+                    OnExecuteWindowsCommand(command));
+}
+
 void NativeWindow::DevToolsFocused() {
   FOR_EACH_OBSERVER(NativeWindowObserver, observers_, OnDevToolsFocus());
 }
@@ -559,6 +581,14 @@ bool NativeWindow::OnMessageReceived(const IPC::Message& message) {
   return handled;
 }
 
+void NativeWindow::UpdateDraggableRegions(
+    const std::vector<DraggableRegion>& regions) {
+  // Draggable region is not supported for non-frameless window.
+  if (has_frame_)
+    return;
+  draggable_region_ = DraggableRegionsToSkRegion(regions);
+}
+
 void NativeWindow::ScheduleUnresponsiveEvent(int ms) {
   if (!window_unresposive_closure_.IsCancelled())
     return;

atom/browser/native_window.h

@@ -23,6 +23,8 @@
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/image/image_skia.h"
 
+class SkRegion;
+
 namespace base {
 class CommandLine;
 }
@@ -203,11 +205,11 @@ class NativeWindow : public content::WebContentsObserver,
   void NotifyWindowLeaveFullScreen();
   void NotifyWindowEnterHtmlFullScreen();
   void NotifyWindowLeaveHtmlFullScreen();
+  void NotifyWindowExecuteWindowsCommand(const std::string& command);
 
   void AddObserver(NativeWindowObserver* obs) {
     observers_.AddObserver(obs);
   }
-
   void RemoveObserver(NativeWindowObserver* obs) {
     observers_.RemoveObserver(obs);
   }
@@ -217,6 +219,10 @@ class NativeWindow : public content::WebContentsObserver,
   }
 
   bool has_frame() const { return has_frame_; }
+  bool transparent() const { return transparent_; }
+  SkRegion* draggable_region() const { return draggable_region_.get(); }
+  bool enable_larger_than_screen() const { return enable_larger_than_screen_; }
+  gfx::ImageSkia icon() const { return icon_; }
 
   void set_has_dialog_attached(bool has_dialog_attached) {
     has_dialog_attached_ = has_dialog_attached;
@@ -226,10 +232,6 @@ class NativeWindow : public content::WebContentsObserver,
   NativeWindow(brightray::InspectableWebContents* inspectable_web_contents,
                const mate::Dictionary& options);
 
-  // Called when the window needs to update its draggable region.
-  virtual void UpdateDraggableRegions(
-      const std::vector<DraggableRegion>& regions) = 0;
-
   // brightray::InspectableWebContentsViewDelegate:
   void DevToolsFocused() override;
   void DevToolsOpened() override;
@@ -241,22 +243,11 @@ class NativeWindow : public content::WebContentsObserver,
   void TitleWasSet(content::NavigationEntry* entry, bool explicit_set) override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
-  // Whether window has standard frame.
-  bool has_frame_;
-
-  // Whether window is transparent.
-  bool transparent_;
-
-  // Whether window can be resized larger than screen.
-  bool enable_larger_than_screen_;
-
-  // Window icon.
-  gfx::ImageSkia icon_;
-
-  // Observers of this window.
-  ObserverList<NativeWindowObserver> observers_;
-
  private:
+  // Called when the window needs to update its draggable region.
+  void UpdateDraggableRegions(
+      const std::vector<DraggableRegion>& regions);
+
   // Schedule a notification unresponsive event.
   void ScheduleUnresponsiveEvent(int ms);
 
@@ -268,6 +259,22 @@ class NativeWindow : public content::WebContentsObserver,
                          const SkBitmap& bitmap,
                          content::ReadbackResponse response);
 
+  // Whether window has standard frame.
+  bool has_frame_;
+
+  // Whether window is transparent.
+  bool transparent_;
+
+  // For custom drag, the whole window is non-draggable and the draggable region
+  // has to been explicitly provided.
+  scoped_ptr<SkRegion> draggable_region_;  // used in custom drag.
+
+  // Whether window can be resized larger than screen.
+  bool enable_larger_than_screen_;
+
+  // Window icon.
+  gfx::ImageSkia icon_;
+
   // The windows has been closed.
   bool is_closed_;
 
@@ -298,6 +305,9 @@ class NativeWindow : public content::WebContentsObserver,
   // The page this window is viewing.
   brightray::InspectableWebContents* inspectable_web_contents_;
 
+  // Observers of this window.
+  ObserverList<NativeWindowObserver> observers_;
+
   base::WeakPtrFactory<NativeWindow> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWindow);

atom/browser/native_window_mac.h

@@ -11,13 +11,11 @@
 #include <vector>
 
 #include "base/mac/scoped_nsobject.h"
-#include "base/memory/scoped_ptr.h"
 #include "atom/browser/native_window.h"
 
 @class AtomNSWindow;
 @class AtomNSWindowDelegate;
 @class FullSizeContentView;
-class SkRegion;
 
 namespace atom {
 
@@ -88,9 +86,6 @@ class NativeWindowMac : public NativeWindow {
   void ClipWebView();
 
  protected:
-  void UpdateDraggableRegions(
-      const std::vector<DraggableRegion>& regions) override;
-
   // NativeWindow:
   void HandleKeyboardEvent(
       content::WebContents*,
@@ -117,10 +112,6 @@ class NativeWindowMac : public NativeWindow {
   // The presentation options before entering kiosk mode.
   NSApplicationPresentationOptions kiosk_options_;
 
-  // For custom drag, the whole window is non-draggable and the draggable region
-  // has to been explicitly provided.
-  scoped_ptr<SkRegion> draggable_region_;  // used in custom drag.
-
   // Mouse location since the last mouse event, in screen coordinates. This is
   // used in custom drag to compute the window movement.
   NSPoint last_mouse_offset_;

atom/browser/native_window_mac.mm

@@ -318,29 +318,6 @@ static const CGFloat kAtomWindowCornerRadius = 4.0;
 
 namespace atom {
 
-namespace {
-
-// Convert draggable regions in raw format to SkRegion format. Caller is
-// responsible for deleting the returned SkRegion instance.
-SkRegion* DraggableRegionsToSkRegion(
-    const std::vector<DraggableRegion>& regions) {
-  SkRegion* sk_region = new SkRegion;
-  for (std::vector<DraggableRegion>::const_iterator iter = regions.begin();
-       iter != regions.end();
-       ++iter) {
-    const DraggableRegion& region = *iter;
-    sk_region->op(
-        region.bounds.x(),
-        region.bounds.y(),
-        region.bounds.right(),
-        region.bounds.bottom(),
-        region.draggable ? SkRegion::kUnion_Op : SkRegion::kDifference_Op);
-  }
-  return sk_region;
-}
-
-}  // namespace
-
 NativeWindowMac::NativeWindowMac(
     brightray::InspectableWebContents* web_contents,
     const mate::Dictionary& options)
@@ -363,7 +340,7 @@ NativeWindowMac::NativeWindowMac(
 
   NSUInteger styleMask = NSTitledWindowMask | NSClosableWindowMask |
                          NSMiniaturizableWindowMask | NSResizableWindowMask;
-  if (!useStandardWindow || transparent_ || !has_frame_) {
+  if (!useStandardWindow || transparent() || !has_frame()) {
     styleMask |= NSTexturedBackgroundWindowMask;
   }
 
@@ -373,12 +350,12 @@ NativeWindowMac::NativeWindowMac(
                   backing:NSBackingStoreBuffered
                     defer:YES]);
   [window_ setShell:this];
-  [window_ setEnableLargerThanScreen:enable_larger_than_screen_];
+  [window_ setEnableLargerThanScreen:enable_larger_than_screen()];
 
   window_delegate_.reset([[AtomNSWindowDelegate alloc] initWithShell:this]);
   [window_ setDelegate:window_delegate_];
 
-  if (transparent_) {
+  if (transparent()) {
     // Make window has transparent background.
     [window_ setOpaque:NO];
     [window_ setHasShadow:NO];
@@ -386,7 +363,7 @@ NativeWindowMac::NativeWindowMac(
   }
 
   // Remove non-transparent corners, see http://git.io/vfonD.
-  if (!has_frame_)
+  if (!has_frame())
     [window_ setOpaque:NO];
 
   // We will manage window's lifetime ourselves.
@@ -395,7 +372,7 @@ NativeWindowMac::NativeWindowMac(
   // On OS X the initial window size doesn't include window frame.
   bool use_content_size = false;
   options.Get(switches::kUseContentSize, &use_content_size);
-  if (!has_frame_ || !use_content_size)
+  if (!has_frame() || !use_content_size)
     SetSize(gfx::Size(width, height));
 
   // Enable the NSView to accept first mouse event.
@@ -532,7 +509,7 @@ gfx::Rect NativeWindowMac::GetBounds() {
 }
 
 void NativeWindowMac::SetContentSize(const gfx::Size& size) {
-  if (!has_frame_) {
+  if (!has_frame()) {
     SetSize(size);
     return;
   }
@@ -550,7 +527,7 @@ void NativeWindowMac::SetContentSize(const gfx::Size& size) {
 }
 
 gfx::Size NativeWindowMac::GetContentSize() {
-  if (!has_frame_)
+  if (!has_frame())
     return GetSize();
 
   NSRect bounds = [[window_ contentView] bounds];
@@ -611,7 +588,7 @@ void NativeWindowMac::Center() {
 
 void NativeWindowMac::SetTitle(const std::string& title) {
   // We don't want the title to show in transparent window.
-  if (transparent_)
+  if (transparent())
     return;
 
   [window_ setTitle:base::SysUTF8ToNSString(title)];
@@ -747,7 +724,7 @@ bool NativeWindowMac::IsVisibleOnAllWorkspaces() {
 }
 
 bool NativeWindowMac::IsWithinDraggableRegion(NSPoint point) const {
-  if (!draggable_region_)
+  if (!draggable_region())
     return false;
   if (!web_contents())
     return false;
@@ -756,7 +733,7 @@ bool NativeWindowMac::IsWithinDraggableRegion(NSPoint point) const {
   // |draggable_region_| is stored in local platform-indepdent coordiate system
   // while |point| is in local Cocoa coordinate system. Do the conversion
   // to match these two.
-  return draggable_region_->contains(point.x, webViewHeight - point.y);
+  return draggable_region()->contains(point.x, webViewHeight - point.y);
 }
 
 void NativeWindowMac::HandleMouseEvent(NSEvent* event) {
@@ -776,15 +753,6 @@ void NativeWindowMac::HandleMouseEvent(NSEvent* event) {
   }
 }
 
-void NativeWindowMac::UpdateDraggableRegions(
-    const std::vector<DraggableRegion>& regions) {
-  // Draggable region is not supported for non-frameless window.
-  if (has_frame_)
-    return;
-
-  draggable_region_.reset(DraggableRegionsToSkRegion(regions));
-}
-
 void NativeWindowMac::HandleKeyboardEvent(
     content::WebContents*,
     const content::NativeWebKeyboardEvent& event) {
@@ -811,7 +779,7 @@ void NativeWindowMac::HandleKeyboardEvent(
 
 void NativeWindowMac::InstallView() {
   NSView* view = inspectable_web_contents()->GetView()->GetNativeView();
-  if (has_frame_) {
+  if (has_frame()) {
     // Add layer with white background for the contents view.
     base::scoped_nsobject<CALayer> layer([[CALayer alloc] init]);
     [layer setBackgroundColor:CGColorGetConstantColor(kCGColorWhite)];

atom/browser/native_window_views.cc

@@ -20,7 +20,6 @@
 #include "brightray/browser/inspectable_web_contents_view.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "native_mate/dictionary.h"
-#include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/hit_test.h"
 #include "ui/gfx/image/image.h"
@@ -39,13 +38,8 @@
 #include "atom/browser/ui/views/native_frame_view.h"
 #include "atom/browser/ui/x/window_state_watcher.h"
 #include "atom/browser/ui/x/x_window_utils.h"
-#include "base/environment.h"
-#include "base/nix/xdg_util.h"
 #include "base/strings/string_util.h"
 #include "chrome/browser/ui/libgtk2ui/unity_service.h"
-#include "dbus/bus.h"
-#include "dbus/object_proxy.h"
-#include "dbus/message.h"
 #include "ui/base/x/x11_util.h"
 #include "ui/gfx/x/x11_types.h"
 #include "ui/views/window/native_frame_view.h"
@@ -70,42 +64,6 @@ const int kMenuBarHeight = 20;
 const int kMenuBarHeight = 25;
 #endif
 
-#if defined(USE_X11)
-// Returns true if the bus name "com.canonical.AppMenu.Registrar" is available.
-bool ShouldUseGlobalMenuBar() {
-  dbus::Bus::Options options;
-  scoped_refptr<dbus::Bus> bus(new dbus::Bus(options));
-
-  dbus::ObjectProxy* object_proxy =
-      bus->GetObjectProxy(DBUS_SERVICE_DBUS, dbus::ObjectPath(DBUS_PATH_DBUS));
-  dbus::MethodCall method_call(DBUS_INTERFACE_DBUS, "ListNames");
-  scoped_ptr<dbus::Response> response(object_proxy->CallMethodAndBlock(
-      &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT));
-  if (!response) {
-    bus->ShutdownAndBlock();
-    return false;
-  }
-
-  dbus::MessageReader reader(response.get());
-  dbus::MessageReader array_reader(NULL);
-  if (!reader.PopArray(&array_reader)) {
-    bus->ShutdownAndBlock();
-    return false;
-  }
-  while (array_reader.HasMoreData()) {
-    std::string name;
-    if (array_reader.PopString(&name) &&
-        name == "com.canonical.AppMenu.Registrar") {
-      bus->ShutdownAndBlock();
-      return true;
-    }
-  }
-
-  bus->ShutdownAndBlock();
-  return false;
-}
-#endif
-
 bool IsAltKey(const content::NativeWebKeyboardEvent& event) {
 #if defined(USE_X11)
   // 164 and 165 represent VK_LALT and VK_RALT.
@@ -232,7 +190,7 @@ NativeWindowViews::NativeWindowViews(
   options.Get(switches::kResizable, &resizable_);
 #endif
 
-  if (enable_larger_than_screen_)
+  if (enable_larger_than_screen())
     // We need to set a default maximum window size here otherwise Windows
     // will not allow us to resize the window larger than scree.
     // Setting directly to INT_MAX somehow doesn't work, so we just devide
@@ -252,9 +210,9 @@ NativeWindowViews::NativeWindowViews(
   params.bounds = bounds;
   params.delegate = this;
   params.type = views::Widget::InitParams::TYPE_WINDOW;
-  params.remove_standard_frame = !has_frame_;
+  params.remove_standard_frame = !has_frame();
 
-  if (transparent_)
+  if (transparent())
     params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
 
 #if defined(USE_X11)
@@ -312,24 +270,24 @@ NativeWindowViews::NativeWindowViews(
   set_background(views::Background::CreateStandardPanelBackground());
   AddChildView(web_view_);
 
-  if (has_frame_ &&
+  if (has_frame() &&
       options.Get(switches::kUseContentSize, &use_content_size_) &&
       use_content_size_)
     bounds = ContentBoundsToWindowBounds(bounds);
 
 #if defined(OS_WIN)
-  if (!has_frame_) {
+  if (!has_frame()) {
     // Set Window style so that we get a minimize and maximize animation when
     // frameless.
     DWORD frame_style = WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX |
                         WS_CAPTION;
     // We should not show a frame for transparent window.
-    if (transparent_)
+    if (transparent())
       frame_style &= ~(WS_THICKFRAME | WS_CAPTION);
     ::SetWindowLong(GetAcceleratedWidget(), GWL_STYLE, frame_style);
   }
 
-  if (transparent_) {
+  if (transparent()) {
     // Transparent window on Windows has to have WS_EX_COMPOSITED style.
     LONG ex_style = ::GetWindowLong(GetAcceleratedWidget(), GWL_EXSTYLE);
     ex_style |= WS_EX_COMPOSITED;
@@ -339,14 +297,14 @@ NativeWindowViews::NativeWindowViews(
 
   // TODO(zcbenz): This was used to force using native frame on Windows 2003, we
   // should check whether setting it in InitParams can work.
-  if (has_frame_) {
+  if (has_frame()) {
     window_->set_frame_type(views::Widget::FrameType::FRAME_TYPE_FORCE_NATIVE);
     window_->FrameTypeChanged();
   }
 
   // The given window is most likely not rectangular since it uses
   // transparency and has no standard frame, don't show a shadow for it.
-  if (transparent_ && !has_frame_)
+  if (transparent() && !has_frame())
     wm::SetShadowType(GetNativeWindow(), wm::SHADOW_TYPE_NONE);
 
   window_->UpdateWindowIcon();
@@ -469,7 +427,7 @@ gfx::Rect NativeWindowViews::GetBounds() {
 }
 
 void NativeWindowViews::SetContentSize(const gfx::Size& size) {
-  if (!has_frame_) {
+  if (!has_frame()) {
     NativeWindow::SetSize(size);
     return;
   }
@@ -480,7 +438,7 @@ void NativeWindowViews::SetContentSize(const gfx::Size& size) {
 }
 
 gfx::Size NativeWindowViews::GetContentSize() {
-  if (!has_frame_)
+  if (!has_frame())
     return GetSize();
 
   gfx::Size content_size =
@@ -628,7 +586,7 @@ void NativeWindowViews::SetMenu(ui::MenuModel* menu_model) {
 #endif
 
   // Do not show menu bar in frameless window.
-  if (!has_frame_)
+  if (!has_frame())
     return;
 
   if (!menu_bar_) {
@@ -753,29 +711,6 @@ gfx::AcceleratedWidget NativeWindowViews::GetAcceleratedWidget() {
   return GetNativeWindow()->GetHost()->GetAcceleratedWidget();
 }
 
-void NativeWindowViews::UpdateDraggableRegions(
-    const std::vector<DraggableRegion>& regions) {
-  if (has_frame_)
-    return;
-
-  SkRegion* draggable_region = new SkRegion;
-
-  // By default, the whole window is non-draggable. We need to explicitly
-  // include those draggable regions.
-  for (std::vector<DraggableRegion>::const_iterator iter = regions.begin();
-       iter != regions.end(); ++iter) {
-    const DraggableRegion& region = *iter;
-    draggable_region->op(
-        region.bounds.x(),
-        region.bounds.y(),
-        region.bounds.right(),
-        region.bounds.bottom(),
-        region.draggable ? SkRegion::kUnion_Op : SkRegion::kDifference_Op);
-  }
-
-  draggable_region_.reset(draggable_region);
-}
-
 void NativeWindowViews::OnWidgetActivationChanged(
     views::Widget* widget, bool active) {
   if (widget != window_.get())
@@ -835,7 +770,7 @@ bool NativeWindowViews::ShouldHandleSystemCommands() const {
 }
 
 gfx::ImageSkia NativeWindowViews::GetWindowAppIcon() {
-  return icon_;
+  return icon();
 }
 
 gfx::ImageSkia NativeWindowViews::GetWindowIcon() {
@@ -858,12 +793,12 @@ bool NativeWindowViews::ShouldDescendIntoChildForEventHandling(
     gfx::NativeView child,
     const gfx::Point& location) {
   // App window should claim mouse events that fall within the draggable region.
-  if (draggable_region_ &&
+  if (draggable_region() &&
-      draggable_region_->contains(location.x(), location.y()))
+      draggable_region()->contains(location.x(), location.y()))
     return false;
 
   // And the events on border for dragging resizable frameless window.
-  if (!has_frame_ && CanResize()) {
+  if (!has_frame() && CanResize()) {
     FramelessView* frame = static_cast<FramelessView*>(
         window_->non_client_view()->frame_view());
     return frame->ResizingBorderHitTest(location) == HTNOWHERE;
@@ -883,7 +818,7 @@ views::NonClientFrameView* NativeWindowViews::CreateNonClientFrameView(
   frame_view->Init(this, widget);
   return frame_view;
 #else
-  if (has_frame_) {
+  if (has_frame()) {
     return new NativeFrameView(this, widget);
   } else {
     FramelessView* frame_view = new FramelessView;
@@ -915,9 +850,7 @@ bool NativeWindowViews::ExecuteWindowsCommand(int command_id) {
     NotifyWindowMaximize();
   } else {
     std::string command = AppCommandToString(command_id);
-    FOR_EACH_OBSERVER(NativeWindowObserver,
+    NotifyWindowExecuteWindowsCommand(command);
-                      observers_,
-                      OnExecuteWindowsCommand(command));
   }
   return false;
 }

atom/browser/native_window_views.h

@@ -82,14 +82,9 @@ class NativeWindowViews : public NativeWindow,
 
   gfx::AcceleratedWidget GetAcceleratedWidget();
 
-  SkRegion* draggable_region() const { return draggable_region_.get(); }
   views::Widget* widget() const { return window_.get(); }
 
  private:
-  // NativeWindow:
-  void UpdateDraggableRegions(
-      const std::vector<DraggableRegion>& regions) override;
-
   // views::WidgetObserver:
   void OnWidgetActivationChanged(
       views::Widget* widget, bool active) override;
@@ -177,8 +172,6 @@ class NativeWindowViews : public NativeWindow,
   gfx::Size maximum_size_;
   gfx::Size widget_size_;
 
-  scoped_ptr<SkRegion> draggable_region_;
-
   DISALLOW_COPY_AND_ASSIGN(NativeWindowViews);
 };
 

atom/browser/ui/x/x_window_utils.cc

@@ -7,6 +7,9 @@
 #include <X11/Xatom.h>
 
 #include "base/strings/string_util.h"
+#include "dbus/bus.h"
+#include "dbus/object_proxy.h"
+#include "dbus/message.h"
 #include "ui/base/x/x11_util.h"
 
 namespace atom {
@@ -46,4 +49,37 @@ void SetWindowType(::Window xwindow, const std::string& type) {
                   reinterpret_cast<unsigned char*>(&window_type), 1);
 }
 
+bool ShouldUseGlobalMenuBar() {
+  dbus::Bus::Options options;
+  scoped_refptr<dbus::Bus> bus(new dbus::Bus(options));
+
+  dbus::ObjectProxy* object_proxy =
+      bus->GetObjectProxy(DBUS_SERVICE_DBUS, dbus::ObjectPath(DBUS_PATH_DBUS));
+  dbus::MethodCall method_call(DBUS_INTERFACE_DBUS, "ListNames");
+  scoped_ptr<dbus::Response> response(object_proxy->CallMethodAndBlock(
+      &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT));
+  if (!response) {
+    bus->ShutdownAndBlock();
+    return false;
+  }
+
+  dbus::MessageReader reader(response.get());
+  dbus::MessageReader array_reader(NULL);
+  if (!reader.PopArray(&array_reader)) {
+    bus->ShutdownAndBlock();
+    return false;
+  }
+  while (array_reader.HasMoreData()) {
+    std::string name;
+    if (array_reader.PopString(&name) &&
+        name == "com.canonical.AppMenu.Registrar") {
+      bus->ShutdownAndBlock();
+      return true;
+    }
+  }
+
+  bus->ShutdownAndBlock();
+  return false;
+}
+
 }  // namespace atom

atom/browser/ui/x/x_window_utils.h

@@ -22,6 +22,9 @@ void SetWMSpecState(::Window xwindow, bool enabled, ::Atom state);
 // Sets the _NET_WM_WINDOW_TYPE of window.
 void SetWindowType(::Window xwindow, const std::string& type);
 
+// Returns true if the bus name "com.canonical.AppMenu.Registrar" is available.
+bool ShouldUseGlobalMenuBar();
+
 }  // namespace atom
 
 #endif  // ATOM_BROWSER_UI_X_X_WINDOW_UTILS_H_