Add overscroll edge effect animations for Android.

content/browser/renderer_host/render_widget_host_view_android.h

Index: content/browser/renderer_host/render_widget_host_view_android.h
diff --git a/content/browser/renderer_host/render_widget_host_view_android.h b/content/browser/renderer_host/render_widget_host_view_android.h
index 44bc78609531ad503d039ad8ef777e6710207135..b53d76d036d6e697da9ea78a08f9dda8045c1fb7 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.h
+++ b/content/browser/renderer_host/render_widget_host_view_android.h
@@ -12,6 +12,7 @@
 #include "base/i18n/rtl.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/process.h"
+#include "base/timer.h"
 #include "content/browser/renderer_host/ime_adapter_android.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "gpu/command_buffer/common/mailbox.h"
@@ -38,6 +39,7 @@ class WebMouseEvent;
 
 namespace content {
 class ContentViewCoreImpl;
+class OverscrollGlow;
 class RenderWidgetHost;
 class RenderWidgetHostImpl;
 class SurfaceTextureTransportClient;
@@ -144,6 +146,9 @@ class RenderWidgetHostViewAndroid : public RenderWidgetHostViewBase {
   virtual void HasTouchEventHandlers(bool need_touch_events) OVERRIDE;
   virtual void OnSwapCompositorFrame(
       scoped_ptr<cc::CompositorFrame> frame) OVERRIDE;
+  virtual void OnOverscrolled(const gfx::Vector2dF& accumulated_overscroll,
+                              const gfx::Vector2dF& current_fling_velocity)
+                                  OVERRIDE;
   virtual void ShowDisambiguationPopup(const gfx::Rect& target_rect,
                                        const SkBitmap& zoomed_bitmap) OVERRIDE;
 
@@ -179,6 +184,11 @@ class RenderWidgetHostViewAndroid : public RenderWidgetHostViewBase {
                       const gfx::Size texture_size,
                       const gfx::SizeF content_size,
                       const base::Closure& ack_callback);
+  void AttachLayers();
+  void RemoveLayers();
+
+  void AnimationCallback();
+  void ScheduleAnimation();
 
   // The model object.
   RenderWidgetHostImpl* host_;
@@ -187,7 +197,7 @@ class RenderWidgetHostViewAndroid : public RenderWidgetHostViewBase {
   // This view may not actually be attached if this is true, but it should be
   // treated as such, because as soon as a ContentViewCore is set the layer
   // will be attached automatically.
-  bool is_layer_attached_;
+  bool are_layers_attached_;
 
   // ContentViewCoreImpl is our interface to the view system.
   ContentViewCoreImpl* content_view_core_;
@@ -220,6 +230,10 @@ class RenderWidgetHostViewAndroid : public RenderWidgetHostViewBase {
   // The mailbox of the frame we last returned.
   gpu::Mailbox last_mailbox_;
 
+  // Used to render overscroll overlays
+  scoped_ptr<OverscrollGlow> overscroll_effect_;
+  base::OneShotTimer<RenderWidgetHostViewAndroid> animation_timer_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };