Deliver IPC messages together with SwapCompositorFrame

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 983f2824cd8a7a53f38c73ab734a59679843fe33..df1977e7e26d2d8b26cb1cde218b93f29f7a48aa 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -5,8 +5,10 @@
 #ifndef CONTENT_BROWSER_RENDER_WIDGET_HOST_DELEGATE_H_
 #define CONTENT_BROWSER_RENDER_WIDGET_HOST_DELEGATE_H_
 
+#include "base/basictypes.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
+#include "content/public/common/widget_visible_state.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace blink {
@@ -64,6 +66,13 @@ class CONTENT_EXPORT RenderWidgetHostDelegate {
   virtual gfx::NativeViewAccessible GetParentNativeViewAccessible();
 #endif
 
+  // TODO: need a better name.
+  virtual void DispatchMessageWithSwapFrame(const IPC::Message&) {}
+
+  virtual void WidgetVisibleStateChanged(
+      int32 page_id,
+      WidgetVisibleState widget_visible_state) {}
+
  protected:
   virtual ~RenderWidgetHostDelegate() {}
 };