Reducing CPU cycles of hidden/minimized browser windows

ui/views/controls/native/native_view_host_aura.h

 // Copyright (c) 2011 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 UI_VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_AURA_H_
 #define UI_VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_AURA_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/aura/window_observer.h"
@@ skipping 21 matching lines @@
   virtual void UninstallClip() OVERRIDE;
   virtual void ShowWidget(int x, int y, int w, int h) OVERRIDE;
   virtual void HideWidget() OVERRIDE;
   virtual void SetFocus() OVERRIDE;
   virtual gfx::NativeViewAccessible GetNativeViewAccessible() OVERRIDE;
   virtual gfx::NativeCursor GetCursor(int x, int y) OVERRIDE;
 
  private:
   // Overridden from aura::WindowObserver:
   virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
+  virtual void OnWindowVisibilityChanged(aura::Window* window,
+                                         bool is_visible) OVERRIDE;
 
   // Our associated NativeViewHost.
   NativeViewHost* host_;
 
   // Have we installed a clip region?
   bool installed_clip_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewHostAura);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_AURA_H_