Reducing CPU cycles of hidden/minimized browser windows

content/browser/web_contents/web_contents_view_aura.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/renderer_host/overscroll_controller_delegate.h"
 #include "content/browser/renderer_host/render_view_host_delegate_view.h"
 #include "content/browser/web_contents/web_contents_view.h"
 #include "content/common/content_export.h"
 #include "ui/aura/window_delegate.h"
+#include "ui/aura/window_observer.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/wm/public/drag_drop_delegate.h"
 
 namespace aura {
 class Window;
 }
 
 namespace ui {
 class DropTargetEvent;
 }
 
 namespace content {
 class GestureNavSimple;
 class OverscrollNavigationOverlay;
 class RenderWidgetHostImpl;
 class ShadowLayerDelegate;
 class TouchEditableImplAura;
 class WebContentsViewDelegate;
 class WebContentsImpl;
 class WebDragDestDelegate;
 
 class WebContentsViewAura
     : public WebContentsView,
       public RenderViewHostDelegateView,
       public OverscrollControllerDelegate,
       public ui::ImplicitAnimationObserver,
       public aura::WindowDelegate,
-      public aura::client::DragDropDelegate {
+      public aura::client::DragDropDelegate,
+      public aura::WindowObserver {
  public:
   WebContentsViewAura(WebContentsImpl* web_contents,
                       WebContentsViewDelegate* delegate);
 
   CONTENT_EXPORT void SetupOverlayWindowForTesting();
 
   CONTENT_EXPORT void SetTouchEditableForTest(
       TouchEditableImplAura* touch_editable);
 
  private:
@@ skipping 114 matching lines @@
   // Overridden from ui::EventHandler:
   virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
   virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
 
   // Overridden from aura::client::DragDropDelegate:
   virtual void OnDragEntered(const ui::DropTargetEvent& event) OVERRIDE;
   virtual int OnDragUpdated(const ui::DropTargetEvent& event) OVERRIDE;
   virtual void OnDragExited() OVERRIDE;
   virtual int OnPerformDrop(const ui::DropTargetEvent& event) OVERRIDE;
 
+  // Overridden from aura::WindowObserver:
+  virtual void OnWindowParentChanged(aura::Window* window,
+                                     aura::Window* parent) OVERRIDE;
+  virtual void OnWindowVisibilityChanged(aura::Window* window,
+                                         bool visible) OVERRIDE;
+
   scoped_ptr<aura::Window> window_;
 
   // The window that shows the screenshot of the history page during an
   // overscroll navigation gesture.
   scoped_ptr<aura::Window> overscroll_window_;
 
   scoped_ptr<WindowObserver> window_observer_;
 
   // The WebContentsImpl whose contents we display.
   WebContentsImpl* web_contents_;
@@ skipping 29 matching lines @@
 
   scoped_ptr<TouchEditableImplAura> touch_editable_;
   scoped_ptr<GestureNavSimple> gesture_nav_simple_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_