Refactor postMessage for out-of-process iframes.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index beeff5538cb3bea47c79f1d50706a0aa2f658237..401738749de4304503838654cab084fb1af8fcb5 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -44,6 +44,7 @@ class GURL;
 class TransportDIB;
 struct FrameHostMsg_AddNavigationTransitionData_Params;
 struct FrameMsg_NewFrame_WidgetParams;
+struct FrameMsg_PostMessage_Params;
 struct FrameMsg_TextTrackSettings_Params;
 
 namespace blink {
@@ -642,6 +643,7 @@ class CONTENT_EXPORT RenderFrameImpl
   void OnDidUpdateSandboxFlags(SandboxFlags flags);
   void OnTextTrackSettingsChanged(
       const FrameMsg_TextTrackSettings_Params& params);
+  void OnPostMessageEvent(const FrameMsg_PostMessage_Params& params);
 #if defined(OS_ANDROID)
   void OnSelectPopupMenuItems(bool canceled,
                               const std::vector<int>& selected_indices);