Flag and adapter class for software compositing.

content/renderer/gpu/compositor_output_surface.h

Index: content/renderer/gpu/compositor_output_surface.h
diff --git a/content/renderer/gpu/compositor_output_surface.h b/content/renderer/gpu/compositor_output_surface.h
index 3f4ed8837d989af14c3b495e3fc7c60207f3d4ff..9479438b5b366d971142c20e2d71fe82b17fa094 100644
--- a/content/renderer/gpu/compositor_output_surface.h
+++ b/content/renderer/gpu/compositor_output_surface.h
@@ -11,6 +11,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/time.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebCompositorOutputSurfaceSoftware.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebCompositorOutputSurface.h"
 
 namespace base {
@@ -33,7 +34,8 @@ class CompositorOutputSurface
       base::TaskRunner* target_task_runner);
 
   CompositorOutputSurface(int32 routing_id,
-                          WebKit::WebGraphicsContext3D* context3d);
+                          WebKit::WebGraphicsContext3D* context3d,
+                          WebKit::WebCompositorOutputSurfaceSoftware* software);
   virtual ~CompositorOutputSurface();
 
   // WebCompositorOutputSurface implementation.
@@ -41,6 +43,8 @@ class CompositorOutputSurface
       WebKit::WebCompositorOutputSurfaceClient* client) OVERRIDE;
   virtual const Capabilities& capabilities() const OVERRIDE;
   virtual WebKit::WebGraphicsContext3D* context3D() const OVERRIDE;
+  virtual WebKit::WebCompositorOutputSurfaceSoftware* surfaceSoftware()
+      const;
   virtual void sendFrameToParentCompositor(
       const WebKit::WebCompositorFrame&) OVERRIDE;
 
@@ -54,7 +58,7 @@ class CompositorOutputSurface
   int routing_id_;
   Capabilities capabilities_;
   scoped_ptr<WebKit::WebGraphicsContext3D> context3D_;
+  scoped_ptr<WebKit::WebCompositorOutputSurfaceSoftware> surface_software_;
 };
 
 #endif  // CONTENT_RENDERER_GPU_COMPOSITOR_OUTPUT_SURFACE_H_
-