diff --git a/atom/browser/native_window.cc b/atom/browser/native_window.cc
index 9e2c11aec4ab..f06841cb67ad 100644
--- a/atom/browser/native_window.cc
+++ b/atom/browser/native_window.cc
@@ -251,7 +251,7 @@ void NativeWindow::SetSizeConstraints(
   SetContentSizeConstraints(content_constraints);
 }
 
-extensions::SizeConstraints NativeWindow::GetSizeConstraints() {
+extensions::SizeConstraints NativeWindow::GetSizeConstraints() const {
   extensions::SizeConstraints content_constraints = GetContentSizeConstraints();
   extensions::SizeConstraints window_constraints;
   if (content_constraints.HasMaximumSize()) {
@@ -272,7 +272,7 @@ void NativeWindow::SetContentSizeConstraints(
   size_constraints_ = size_constraints;
 }
 
-extensions::SizeConstraints NativeWindow::GetContentSizeConstraints() {
+extensions::SizeConstraints NativeWindow::GetContentSizeConstraints() const {
   return size_constraints_;
 }
 
@@ -282,7 +282,7 @@ void NativeWindow::SetMinimumSize(const gfx::Size& size) {
   SetSizeConstraints(size_constraints);
 }
 
-gfx::Size NativeWindow::GetMinimumSize() {
+gfx::Size NativeWindow::GetMinimumSize() const {
   return GetSizeConstraints().GetMinimumSize();
 }
 
@@ -292,7 +292,7 @@ void NativeWindow::SetMaximumSize(const gfx::Size& size) {
   SetSizeConstraints(size_constraints);
 }
 
-gfx::Size NativeWindow::GetMaximumSize() {
+gfx::Size NativeWindow::GetMaximumSize() const {
   return GetSizeConstraints().GetMaximumSize();
 }
 
diff --git a/atom/browser/native_window.h b/atom/browser/native_window.h
index b0d25e03f232..f5aa5523bffa 100644
--- a/atom/browser/native_window.h
+++ b/atom/browser/native_window.h
@@ -98,14 +98,14 @@ class NativeWindow : public base::SupportsUserData,
   virtual gfx::Rect GetContentBounds();
   virtual void SetSizeConstraints(
       const extensions::SizeConstraints& size_constraints);
-  virtual extensions::SizeConstraints GetSizeConstraints();
+  virtual extensions::SizeConstraints GetSizeConstraints() const;
   virtual void SetContentSizeConstraints(
       const extensions::SizeConstraints& size_constraints);
-  virtual extensions::SizeConstraints GetContentSizeConstraints();
+  virtual extensions::SizeConstraints GetContentSizeConstraints() const;
   virtual void SetMinimumSize(const gfx::Size& size);
-  virtual gfx::Size GetMinimumSize();
+  virtual gfx::Size GetMinimumSize() const;
   virtual void SetMaximumSize(const gfx::Size& size);
-  virtual gfx::Size GetMaximumSize();
+  virtual gfx::Size GetMaximumSize() const;
   virtual void SetSheetOffset(const double offsetX, const double offsetY);
   virtual double GetSheetOffsetX();
   virtual double GetSheetOffsetY();
@@ -147,9 +147,9 @@ class NativeWindow : public base::SupportsUserData,
   virtual void SetMenu(AtomMenuModel* menu);
   virtual void SetParentWindow(NativeWindow* parent);
   virtual void SetBrowserView(NativeBrowserView* browser_view) = 0;
-  virtual gfx::NativeView GetNativeView() = 0;
-  virtual gfx::NativeWindow GetNativeWindow() = 0;
-  virtual gfx::AcceleratedWidget GetAcceleratedWidget() = 0;
+  virtual gfx::NativeView GetNativeView() const = 0;
+  virtual gfx::NativeWindow GetNativeWindow() const = 0;
+  virtual gfx::AcceleratedWidget GetAcceleratedWidget() const = 0;
 
   // Taskbar/Dock APIs.
   enum ProgressState {
@@ -281,8 +281,10 @@ class NativeWindow : public base::SupportsUserData,
       const std::vector<DraggableRegion>& regions);
 
   // Converts between content bounds and window bounds.
-  virtual gfx::Rect ContentBoundsToWindowBounds(const gfx::Rect& bounds) = 0;
-  virtual gfx::Rect WindowBoundsToContentBounds(const gfx::Rect& bounds) = 0;
+  virtual gfx::Rect ContentBoundsToWindowBounds(
+      const gfx::Rect& bounds) const = 0;
+  virtual gfx::Rect WindowBoundsToContentBounds(
+      const gfx::Rect& bounds) const = 0;
 
   // Called when the window needs to update its draggable region.
   virtual void UpdateDraggableRegions(
diff --git a/atom/browser/native_window_views.cc b/atom/browser/native_window_views.cc
index 00f0befd50fa..81a846268211 100644
--- a/atom/browser/native_window_views.cc
+++ b/atom/browser/native_window_views.cc
@@ -924,11 +924,11 @@ void NativeWindowViews::SetParentWindow(NativeWindow* parent) {
 #endif
 }
 
-gfx::NativeView NativeWindowViews::GetNativeView() {
+gfx::NativeView NativeWindowViews::GetNativeView() const {
   return window_->GetNativeView();
 }
 
-gfx::NativeWindow NativeWindowViews::GetNativeWindow() {
+gfx::NativeWindow NativeWindowViews::GetNativeWindow() const {
   return window_->GetNativeWindow();
 }
 
@@ -999,7 +999,7 @@ bool NativeWindowViews::IsVisibleOnAllWorkspaces() {
   return false;
 }
 
-gfx::AcceleratedWidget NativeWindowViews::GetAcceleratedWidget() {
+gfx::AcceleratedWidget NativeWindowViews::GetAcceleratedWidget() const {
   return GetNativeWindow()->GetHost()->GetAcceleratedWidget();
 }
 
@@ -1180,7 +1180,7 @@ void NativeWindowViews::OnWidgetMove() {
 }
 
 gfx::Rect NativeWindowViews::ContentBoundsToWindowBounds(
-    const gfx::Rect& bounds) {
+    const gfx::Rect& bounds) const {
   if (!has_frame())
     return bounds;
 
@@ -1201,7 +1201,7 @@ gfx::Rect NativeWindowViews::ContentBoundsToWindowBounds(
 }
 
 gfx::Rect NativeWindowViews::WindowBoundsToContentBounds(
-    const gfx::Rect& bounds) {
+    const gfx::Rect& bounds) const {
   if (!has_frame())
     return bounds;
 
@@ -1306,11 +1306,11 @@ void NativeWindowViews::Layout() {
   }
 }
 
-gfx::Size NativeWindowViews::GetMinimumSize() {
+gfx::Size NativeWindowViews::GetMinimumSize() const {
   return NativeWindow::GetMinimumSize();
 }
 
-gfx::Size NativeWindowViews::GetMaximumSize() {
+gfx::Size NativeWindowViews::GetMaximumSize() const {
   return NativeWindow::GetMaximumSize();
 }
 
diff --git a/atom/browser/native_window_views.h b/atom/browser/native_window_views.h
index 15bdbad18808..a7247e8fe004 100644
--- a/atom/browser/native_window_views.h
+++ b/atom/browser/native_window_views.h
@@ -106,8 +106,8 @@ class NativeWindowViews : public NativeWindow,
   void SetMenu(AtomMenuModel* menu_model) override;
   void SetBrowserView(NativeBrowserView* browser_view) override;
   void SetParentWindow(NativeWindow* parent) override;
-  gfx::NativeView GetNativeView() override;
-  gfx::NativeWindow GetNativeWindow() override;
+  gfx::NativeView GetNativeView() const override;
+  gfx::NativeWindow GetNativeWindow() const override;
   void SetOverlayIcon(const gfx::Image& overlay,
                       const std::string& description) override;
   void SetProgressBar(double progress, const ProgressState state) override;
@@ -118,7 +118,7 @@ class NativeWindowViews : public NativeWindow,
   void SetVisibleOnAllWorkspaces(bool visible) override;
   bool IsVisibleOnAllWorkspaces() override;
 
-  gfx::AcceleratedWidget GetAcceleratedWidget() override;
+  gfx::AcceleratedWidget GetAcceleratedWidget() const override;
 
 #if defined(OS_WIN)
   void SetIcon(HICON small_icon, HICON app_icon);
@@ -171,16 +171,16 @@ class NativeWindowViews : public NativeWindow,
 #endif
 
   // NativeWindow:
-  gfx::Rect ContentBoundsToWindowBounds(const gfx::Rect& bounds) override;
-  gfx::Rect WindowBoundsToContentBounds(const gfx::Rect& bounds) override;
+  gfx::Rect ContentBoundsToWindowBounds(const gfx::Rect& bounds) const override;
+  gfx::Rect WindowBoundsToContentBounds(const gfx::Rect& bounds) const override;
   void HandleKeyboardEvent(
       content::WebContents*,
       const content::NativeWebKeyboardEvent& event) override;
 
   // views::View:
   void Layout() override;
-  gfx::Size GetMinimumSize() override;
-  gfx::Size GetMaximumSize() override;
+  gfx::Size GetMinimumSize() const override;
+  gfx::Size GetMaximumSize() const override;
   bool AcceleratorPressed(const ui::Accelerator& accelerator) override;
 
   // Register accelerators supported by the menu model.