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 3e68f2bef3c474615dba221fd5cb6309e9b258d4..1aa32709cb7126cf9b70f086b3bdd0b1ea095e48 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.h
+++ b/content/browser/renderer_host/render_widget_host_view_aura.h
@@ -157,6 +157,8 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   virtual bool IsShowing() OVERRIDE;
   virtual gfx::Rect GetViewBounds() const OVERRIDE;
   virtual void SetBackground(const SkBitmap& background) OVERRIDE;
+  virtual int GetVisibleViewportHeight() const OVERRIDE;
+  virtual void SetKeyboardBounds(const gfx::Rect& bounds) OVERRIDE;
 
   // Overridden from RenderWidgetHostViewPort:
   virtual void InitAsPopup(RenderWidgetHostView* parent_host_view,
@@ -240,6 +242,7 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   virtual void OnSwapCompositorFrame(
       uint32 output_surface_id,
       scoped_ptr<cc::CompositorFrame> frame) OVERRIDE;
+
 #if defined(OS_WIN)
   virtual void SetParentNativeViewAccessible(
       gfx::NativeViewAccessible accessible_parent) OVERRIDE;
@@ -405,6 +408,8 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
                            UpdateCursorIfOverSelf);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraCopyRequestTest,
                            DestroyedAfterCopyRequest);
+  FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest,
+                           VisibleViewportTest);
 
   class WindowObserver;
   friend class WindowObserver;
@@ -724,6 +729,8 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
 
   TouchEditingClient* touch_editing_client_;
 
+  gfx::Rect virtual_keyboard_bounds_;
+
   std::vector<ui::LatencyInfo> software_latency_info_;
 
   scoped_ptr<DelegatedFrameEvictor> delegated_frame_evictor_;