aura: Make RenderWidgetHostViewAura::CopyFromCompositingSurface readback layer

Currently CopyFromCompositingSurface does an async texture readback of
current_surface_ which depends on the renderer compositor sending
textures to the browser compositor. Under ubercomp, however, the
current_surface_ will not exist.

The cc/ compositor now supports async readback of layers. This uses the
new mechanism to get the contents of the RWHVA's ui::Layer instead which
is always available. The result of this readback can be a texture or a
bitmap (when using software compositing). The result read by the
compositor will already be cropped.

If the result is a texture, we use the GLHelper to scale the result to
the desired size. If it is a bitmap, we use skia::ImageOperations::Resize
to do the same.

R=piman
BUG=162291

Review URL: https://chromiumcodereview.appspot.com/17971002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@210106 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 7 insertions, 0 deletions

diff --git a/content/port/browser/render_widget_host_view_port.h b/content/port/browser/render_widget_host_view_port.h
index 9b1f7fc..3028a70 100644
--- a/content/port/browser/render_widget_host_view_port.h
+++ b/content/port/browser/render_widget_host_view_port.h
@@ -295,6 +295,13 @@ class CONTENT_EXPORT RenderWidgetHostViewPort : public RenderWidgetHostView,
   virtual void OnAccessibilityNotifications(
       const std::vector<AccessibilityHostMsg_NotificationParams>& params) = 0;
 
+  // Return a value that is incremented each time the renderer swaps a new frame
+  // to the view.
+  virtual uint32 RendererFrameNumber() = 0;
+  // Called each time the RenderWidgetHost receives a new frame for display from
+  // the renderer.
+  virtual void DidReceiveRendererFrame() = 0;
+
 #if defined(OS_MACOSX)
   // Called just before GetBackingStore blocks for an updated frame.
   virtual void AboutToWaitForBackingStoreMsg() = 0;