Implement overscroll support for the virtual keyboard.

content/browser/renderer_host/render_widget_host_view_aura.h

Index: content/browser/renderer_host/render_widget_host_view_aura.h
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.h b/content/browser/renderer_host/render_widget_host_view_aura.h
index bc2ad37a2f858a18c073c158fe2d2c3e3c8ef49d..a57c4a19d75f32cabab5aa0ba2c41329a007a91b 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.h
+++ b/content/browser/renderer_host/render_widget_host_view_aura.h
@@ -31,6 +31,7 @@
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/cursor_client_observer.h"
 #include "ui/aura/client/focus_change_observer.h"
+#include "ui/aura/client/virtual_keyboard_observer.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/aura/window_tree_host_observer.h"
 #include "ui/base/ime/text_input_client.h"
@@ -94,6 +95,7 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
       public aura::client::ActivationChangeObserver,
       public aura::client::FocusChangeObserver,
       public aura::client::CursorClientObserver,
+      public aura::client::VirtualKeyboardObserver,
       public ImageTransportFactoryObserver,
       public BrowserAccessibilityDelegate,
       public SoftwareFrameManagerClient,
@@ -239,6 +241,7 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   virtual void OnSwapCompositorFrame(
       uint32 output_surface_id,
       scoped_ptr<cc::CompositorFrame> frame) OVERRIDE;
+  virtual float GetOverdrawBottomHeight() const OVERRIDE;
 #if defined(OS_WIN)
   virtual void SetParentNativeViewAccessible(
       gfx::NativeViewAccessible accessible_parent) OVERRIDE;
@@ -320,6 +323,9 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   // Overridden from aura::client::CursorClientObserver:
   virtual void OnCursorVisibilityChanged(bool is_visible) OVERRIDE;
 
+  // Overridden from aura::client::VirtualKeyboardObserver:
+  virtual void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) OVERRIDE;
+
   // Overridden from aura::client::FocusChangeObserver:
   virtual void OnWindowFocused(aura::Window* gained_focus,
                                aura::Window* lost_focus) OVERRIDE;
@@ -755,6 +761,9 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   // over this view changes, we need this information in order to create a new
   // region for the HWND.
   PluginWindowMoves plugin_window_moves_;
+#elif defined(OS_CHROMEOS)
+  // Bounds of onscreen keyboard.
+  gfx::Rect virtual_keyboard_bounds_;
 #endif
 
   base::TimeTicks last_draw_ended_;