Browser Plugin: Add HTML5-like postMessage support

content/renderer/browser_plugin/browser_plugin.h

Index: content/renderer/browser_plugin/browser_plugin.h
diff --git a/content/renderer/browser_plugin/browser_plugin.h b/content/renderer/browser_plugin/browser_plugin.h
index f646f3c241c3649da64441d4e0845de30888f403..359b8b01bc90225e659f55904975db0f15d9e613 100644
--- a/content/renderer/browser_plugin/browser_plugin.h
+++ b/content/renderer/browser_plugin/browser_plugin.h
@@ -38,6 +38,8 @@ class CONTENT_EXPORT BrowserPlugin :
   // Set the src attribute value of the BrowserPlugin instance and reset
   // the guest_crashed_ flag.
   void SetSrcAttribute(const std::string& src);
+  // Get the guest's DOMWindow proxy.
+  NPObject* GetContentWindow() const;
   // Returns Chrome's process ID for the current guest.
   int process_id() const { return process_id_; }
   // The partition identifier string is stored as UTF-8.
@@ -72,6 +74,10 @@ class CONTENT_EXPORT BrowserPlugin :
   // element.
   void AdvanceFocus(bool reverse);
 
+  // Inform the BrowserPlugin that the guest's contentWindow is ready,
+  // and provide it with a routing ID to grab it.
+  void GuestContentWindowReady(int content_window_routing_id);
+
   // Informs the BrowserPlugin that the guest has started/stopped accepting
   // touch events.
   void SetAcceptTouchEvents(bool accept);
@@ -202,6 +208,7 @@ class CONTENT_EXPORT BrowserPlugin :
   int process_id_;
   std::string storage_partition_id_;
   bool persist_storage_;
+  int content_window_routing_id_;
   // Tracks the visibility of the browser plugin regardless of the whole
   // embedder RenderView's visibility.
   bool visible_;