Add SetVisibleOnAllWorkspaces/IsVisibleOnAllWorkspaces API.

These two APIs are only available on OS X/Linux platforms.

atom/browser/api/atom_api_window.cc

@@ -424,6 +424,16 @@ void Window::ShowDefinitionForSelection() {
 }
 #endif
 
+#if defined(OS_MACOSX) || defined(OS_LINUX)
+void Window::SetVisibleOnAllWorkspaces(bool visible) {
+  return window_->SetVisibleOnAllWorkspaces(visible);
+}
+
+bool Window::IsVisibleOnAllWorkspaces() {
+  return window_->IsVisibleOnAllWorkspaces();
+}
+#endif
+
 mate::Handle<WebContents> Window::GetWebContents(v8::Isolate* isolate) const {
   return WebContents::CreateFrom(isolate, window_->GetWebContents());
 }
@@ -494,6 +504,12 @@ void Window::BuildPrototype(v8::Isolate* isolate,
       .SetMethod("isMenuBarAutoHide", &Window::IsMenuBarAutoHide)
       .SetMethod("setMenuBarVisibility", &Window::SetMenuBarVisibility)
       .SetMethod("isMenuBarVisible", &Window::IsMenuBarVisible)
+#if defined(OS_MACOSX) || defined(OS_LINUX)
+      .SetMethod("setVisibleOnAllWorkspaces",
+                 &Window::SetVisibleOnAllWorkspaces)
+      .SetMethod("isVisibleOnAllWorkspaces",
+                 &Window::IsVisibleOnAllWorkspaces)
+#endif
 #if defined(OS_MACOSX)
       .SetMethod("showDefinitionForSelection",
                  &Window::ShowDefinitionForSelection)

atom/browser/api/atom_api_window.h

@@ -130,6 +130,11 @@ class Window : public mate::EventEmitter,
   void ShowDefinitionForSelection();
 #endif
 
+#if defined(OS_MACOSX) || defined(OS_LINUX)
+  void SetVisibleOnAllWorkspaces(bool visible);
+  bool IsVisibleOnAllWorkspaces();
+#endif
+
   // APIs for WebContents.
   mate::Handle<WebContents> GetWebContents(v8::Isolate* isolate) const;
   mate::Handle<WebContents> GetDevToolsWebContents(v8::Isolate* isolate) const;