Implement transform/clip support for Android WebView.

cc/output/output_surface_client.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_OUTPUT_OUTPUT_SURFACE_CLIENT_H_
 #define CC_OUTPUT_OUTPUT_SURFACE_CLIENT_H_
 
 #include "base/time.h"
 #include "cc/base/cc_export.h"
 #include "ui/gfx/rect.h"
 
+namespace gfx {
+class Transform;
+}
+
 namespace cc {
 
 class CompositorFrameAck;
 
 class CC_EXPORT OutputSurfaceClient {
  public:
   virtual void SetNeedsRedrawRect(gfx::Rect damage_rect) = 0;
   virtual void OnVSyncParametersChanged(base::TimeTicks timebase,
                                         base::TimeDelta interval) = 0;
   virtual void BeginFrame(base::TimeTicks frame_time) = 0;
   virtual void OnSendFrameToParentCompositorAck(
       const CompositorFrameAck& ack) = 0;
   virtual void OnSwapBuffersComplete() = 0;
   virtual void DidLoseOutputSurface() = 0;
+  virtual void SetExternalDrawConstraints(const gfx::Transform& transform,
+                                          gfx::Rect viewport) = 0;
 
  protected:
   virtual ~OutputSurfaceClient() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OUTPUT_SURFACE_CLIENT_H_