Expose locks for CopyFromCompositingSurface/CopyFromBackingStore API

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 37879af679bc6c3cb7d8dd889577a61e9fb242de..58383f044d1afc4beee035e5d9dfd58825290a2d 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.h
+++ b/content/browser/renderer_host/render_widget_host_view_android.h
@@ -175,6 +175,8 @@ class RenderWidgetHostViewAndroid
                                        const SkBitmap& zoomed_bitmap) OVERRIDE;
   virtual scoped_ptr<SyntheticGestureTarget> CreateSyntheticGestureTarget()
       OVERRIDE;
+  virtual void LockCompositingSurface() OVERRIDE;
+  virtual void UnlockCompositingSurface() OVERRIDE;
 
   // Implementation of BrowserAccessibilityDelegate:
   virtual void SetAccessibilityFocus(int acc_obj_id) OVERRIDE;
@@ -220,9 +222,6 @@ class RenderWidgetHostViewAndroid
   void OnSetNeedsBeginFrame(bool enabled);
   void OnSmartClipDataExtracted(const base::string16& result);
 
-  void LockResources();
-  void UnlockResources();
-
   long GetNativeImeAdapter();
 
   void WasResized();
@@ -297,6 +296,19 @@ class RenderWidgetHostViewAndroid
 
   bool IsReadbackConfigSupported(SkBitmap::Config bitmap_config);
 
+  // If we have locks on a frame during a ContentViewCore swap or a context
+  // lost, the frame is no longer valid and we can safely release all the locks.
+  // Use this method to release all the locks.
+  void ReleaseLocksOnSurface();
+
+  // Drop any incoming frames from the renderer when there are locks on the
+  // current frame.
+  void RetainFrame(uint32 output_surface_id,
+                   scoped_ptr<cc::CompositorFrame> frame);
+
+  void InternalSwapCompositorFrame(uint32 output_surface_id,
+                                   scoped_ptr<cc::CompositorFrame> frame);
+
   // The model object.
   RenderWidgetHostImpl* host_;
 
@@ -362,6 +374,18 @@ class RenderWidgetHostViewAndroid
 
   bool using_delegated_renderer_;
 
+  size_t locks_on_frame_count_;
+
+  struct LastFrameInfo {
+    LastFrameInfo(uint32 output_id,
+                  scoped_ptr<cc::CompositorFrame> output_frame);
+    ~LastFrameInfo();
+    uint32 output_surface_id;
+    scoped_ptr<cc::CompositorFrame> frame;
+  };
+
+  scoped_ptr<LastFrameInfo> last_frame_info_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };