Implement transform/clip support for Android WebView.

cc/output/gl_renderer.h

Index: cc/output/gl_renderer.h
diff --git a/cc/output/gl_renderer.h b/cc/output/gl_renderer.h
index 1c30d344f4607cfc5d1d3ef8f940f91c5c504700..10d5ce46d5a28745880e6e92c5b222b99dc0483d 100644
--- a/cc/output/gl_renderer.h
+++ b/cc/output/gl_renderer.h
@@ -105,7 +105,7 @@ class CC_EXPORT GLRenderer
   virtual bool BindFramebufferToTexture(DrawingFrame* frame,
                                         const ScopedResource* resource,
                                         gfx::Rect framebuffer_rect) OVERRIDE;
-  virtual void SetDrawViewportSize(gfx::Size viewport_size) OVERRIDE;
+  virtual void SetDrawViewport(gfx::Rect viewport) OVERRIDE;
   virtual void SetScissorTestRect(gfx::Rect scissor_rect) OVERRIDE;
   virtual void ClearFramebuffer(DrawingFrame* frame) OVERRIDE;
   virtual void DoDrawQuad(DrawingFrame* frame, const class DrawQuad*) OVERRIDE;
@@ -399,7 +399,6 @@ class CC_EXPORT GLRenderer
   scoped_ptr<SolidColorProgram> solid_color_program_;
   scoped_ptr<SolidColorProgramAA> solid_color_program_aa_;
 
-  OutputSurface* output_surface_;
   WebKit::WebGraphicsContext3D* context_;
 
   skia::RefPtr<GrContext> gr_context_;
@@ -407,7 +406,6 @@ class CC_EXPORT GLRenderer
 
   gfx::Rect swap_buffer_rect_;
   gfx::Rect scissor_rect_;
-  bool is_viewport_changed_;
   bool is_backbuffer_discarded_;
   bool discard_backbuffer_when_not_visible_;
   bool is_using_bind_uniform_;