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 f4a52cde5e1d99f36d9624ecc0c27c9bf9597a24..c82bb86e628e371f5b6d7138fc7d7c55bdd69d71 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;
@@ -152,6 +154,9 @@ class RenderWidgetHostViewAndroid : public RenderWidgetHostViewBase {
                                const gfx::Vector2dF& controls_offset,
                                const gfx::Vector2dF& content_offset,
                                float overdraw_bottom_height) 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;
 
@@ -167,6 +172,7 @@ class RenderWidgetHostViewAndroid : public RenderWidgetHostViewBase {
   void OnProcessImeBatchStateAck(bool is_begin);
   void OnDidChangeBodyBackgroundColor(SkColor color);
   void OnStartContentIntent(const GURL& content_url);
+  void OnSetOverscrollResources();
 
   int GetNativeImeAdapter();
 
@@ -187,6 +193,14 @@ class RenderWidgetHostViewAndroid : public RenderWidgetHostViewBase {
                       const gfx::Size texture_size,
                       const gfx::SizeF content_size,
                       const base::Closure& ack_callback);
+  void AttachLayers();
+  void RemoveLayers();
+
+  void SetOverscrollEffect(scoped_ptr<OverscrollGlow> overscroll_effect);
+  void AnimationCallback();
+  void AnimateIfNeeded();
+
+  enum { kDesiredAnimationIntervalInMs = 16 };
 
   // The model object.
   RenderWidgetHostImpl* host_;
@@ -195,7 +209,7 @@ 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_;
@@ -208,9 +222,7 @@ class RenderWidgetHostViewAndroid : public RenderWidgetHostViewBase {
   // The texture layer for this view when using browser-side compositing.
   scoped_refptr<cc::TextureLayer> texture_layer_;
 
-  // The layer used for rendering the contents of this view.
-  // It is either owned by texture_layer_ or surface_texture_transport_
-  // depending on the mode.
+  // Layer used for rendering the contents of this view.
   scoped_refptr<cc::Layer> layer_;
 
   // The most recent texture id that was pushed to the texture layer.
@@ -228,6 +240,11 @@ class RenderWidgetHostViewAndroid : public RenderWidgetHostViewBase {
   // The mailbox of the frame we last returned.
   gpu::Mailbox last_mailbox_;
 
+  // Used to render overscroll overlays
+  bool overscroll_resources_updated_;
+  scoped_ptr<OverscrollGlow> overscroll_effect_;
+  base::OneShotTimer<RenderWidgetHostViewAndroid> animation_timer_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };