Adds support for calling postMessage on a frame living in a different renderer.

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index 8e5522a2db4342d4d1409dee4717c2177cebe7bd..d410076c261e509838d0980a3a40d767877f6cfc 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -43,6 +43,7 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebNode.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPageSerializerClient.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPageVisibilityState.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebSecurityOrigin.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebTextDirection.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebViewClient.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebFileSystem.h"
@@ -80,6 +81,7 @@ class RendererAccessibility;
 class RendererWebColorChooserImpl;
 class SkBitmap;
 class InputTagSpeechDispatcher;
+struct ViewHostMsg_PostMessage_Params;
 struct ViewMsg_Navigate_Params;
 struct ViewMsg_StopFinding_Params;
 struct ViewMsg_SwapOut_Params;
@@ -120,6 +122,7 @@ class ResourceFetcher;
 namespace WebKit {
 class WebApplicationCacheHost;
 class WebApplicationCacheHostClient;
+class WebDOMMessageEvent;
 class WebDataSource;
 class WebDragData;
 class WebGeolocationClient;
@@ -596,6 +599,11 @@ class RenderViewImpl : public RenderWidget,
   virtual void willOpenSocketStream(
       WebKit::WebSocketStreamHandle* handle);
 
+  virtual bool willCheckAndDispatchMessageEvent(
+      WebKit::WebFrame* source,
+      WebKit::WebSecurityOrigin targetOrigin,
+      WebKit::WebDOMMessageEvent event) OVERRIDE;
+
   // WebKit::WebPageSerializerClient implementation ----------------------------
 
   virtual void didSerializeDataForFrame(
@@ -872,6 +880,7 @@ class RenderViewImpl : public RenderWidget,
 #if defined(OS_MACOSX)
   void OnPluginImeCompositionCompleted(const string16& text, int plugin_id);
 #endif
+  void OnPostMessageEvent(const ViewHostMsg_PostMessage_Params& params);
   void OnRedo();
   void OnReloadFrame();
   void OnReplace(const string16& text);