Android WebView Merged-Thread Hardware Draw

content/public/renderer/android/synchronous_compositor.h

 // Copyright (c) 2013 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 CONTENT_PUBLIC_RENDERER_ANDROID_SYNCHRONOUS_COMPOSTIOR_
 #define CONTENT_PUBLIC_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_
 
+#include "ui/gfx/rect.h"
+#include "ui/gfx/size.h"
+
 class SkCanvas;
 
+namespace gfx {
+class Transform;
+};
+
 namespace content {
 
 class SynchronousCompositorClient;
 
 // Interface for embedders that which to direct compositing operations
 // synchronously under their own control. Only meaningful when the
 // kEnableSyncrhonousRendererCompositor flag is specified.
 class SynchronousCompositor {
  public:
   // Allows changing or resetting the client to NULL (this must be used if
   // the client is being deleted prior to the DidDestroyCompositor() call
   // being received by the client). Ownership of |client| remains with
   // the caller.
   virtual void SetClient(SynchronousCompositorClient* client) = 0;
 
   // "On demand" SW draw, into the supplied canvas (observing the transform
   // and clip set there-in).
   virtual bool DemandDrawSw(SkCanvas* canvas) = 0;
 
+  // "On demand" hardware draw. The content is first clipped to |damage_area|,
+  // then transformed through |transform|, and finally clipped to |view_size|.
+  virtual bool DemandDrawHw(
+      gfx::Size view_size,
+      const gfx::Transform& transform,
+      gfx::Rect damage_area) = 0;
+
  protected:
   virtual ~SynchronousCompositor() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_ANDROID_SYNCHRONOUS_COMPOSTIOR_