Implement transform/clip support for Android WebView.

cc/output/renderer.h

Index: cc/output/renderer.h
diff --git a/cc/output/renderer.h b/cc/output/renderer.h
index aaf9fd753ffd109934a30b17dc719e05d6096aac..a905d4c06023564d4b0b4d2afa1df86759fc863c 100644
--- a/cc/output/renderer.h
+++ b/cc/output/renderer.h
@@ -20,7 +20,11 @@ class ScopedResource;
 
 class CC_EXPORT RendererClient {
  public:
-  virtual gfx::Size DeviceViewportSize() const = 0;
+  // Draw viewport in non-y-flipped window space. Note that while a draw is in
+  // progress, this is guaranteed to be contained within the output surface
+  // size.
+  virtual gfx::Rect DeviceViewport() const = 0;
+
   virtual float DeviceScaleFactor() const = 0;
   virtual const LayerTreeSettings& Settings() const = 0;
   virtual void SetFullRootLayerDamage() = 0;
@@ -44,12 +48,6 @@ class CC_EXPORT Renderer {
 
   const LayerTreeSettings& Settings() const { return client_->Settings(); }
 
-  gfx::Size ViewportSize() const { return client_->DeviceViewportSize(); }
-  int ViewportWidth() const { return ViewportSize().width(); }
-  int ViewportHeight() const { return ViewportSize().height(); }
-
-  float DeviceScaleFactor() const { return client_->DeviceScaleFactor(); }
-
   virtual void ViewportChanged() {}
   virtual void ReceiveCompositorFrameAck(const CompositorFrameAck& ack) {}