Add IPC messages to transfer compositor protos

content/browser/renderer_host/render_widget_host_delegate.h

Index: content/browser/renderer_host/render_widget_host_delegate.h
diff --git a/content/browser/renderer_host/render_widget_host_delegate.h b/content/browser/renderer_host/render_widget_host_delegate.h
index a96428c7e17c92169b008823d697a51e563ad2f1..604a3ac2bac6d759052aa0f74c9d9dab254df83a 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -5,6 +5,8 @@
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_DELEGATE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_DELEGATE_H_
 
+#include <vector>
+
 #include "base/basictypes.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
@@ -163,6 +165,11 @@ class CONTENT_EXPORT RenderWidgetHostDelegate {
   virtual gfx::NativeViewAccessible GetParentNativeViewAccessible();
 #endif
 
+  // Called when the widget has sent a compositor proto.  This is used in Blimp
+  // mode with the RemoteChannel compositor.
+  virtual void ForwardCompositorProto(RenderWidgetHostImpl* render_widget_host,
+                                      const std::vector<uint8_t>& proto) {}
+
  protected:
   virtual ~RenderWidgetHostDelegate() {}
 };