Browser Plugin: Add HTML5-like postMessage support

content/common/browser_plugin_messages.h

Index: content/common/browser_plugin_messages.h
diff --git a/content/common/browser_plugin_messages.h b/content/common/browser_plugin_messages.h
index 17ddffff5960a7e7fa351ff6b7ec2d125d0ed714..169043479a4dcefa6cfd7935a705048c038ed2d6 100644
--- a/content/common/browser_plugin_messages.h
+++ b/content/common/browser_plugin_messages.h
@@ -27,6 +27,11 @@
 // -----------------------------------------------------------------------------
 // These messages are from the embedder to the browser process.
 
+IPC_MESSAGE_ROUTED3(BrowserPluginHostMsg_RouteMessageEvent,
+                    int /* instance_id */,
+                    string16 /* data */,
+                    string16 /* target_origin */)
+
 // Tells the guest to focus or defocus itself.
 IPC_MESSAGE_ROUTED2(BrowserPluginHostMsg_SetFocus,
                     int /* instance_id */,
@@ -98,6 +103,13 @@ IPC_SYNC_MESSAGE_ROUTED2_0(BrowserPluginHostMsg_ResizeGuest,
 // -----------------------------------------------------------------------------
 // These messages are from the browser process to the embedder.
 
+IPC_MESSAGE_CONTROL4(BrowserPluginMsg_ReceiveMessage,
+                     int /* instance_id */,
+                     int /* source_routing_id */,
+                     string16 /* source_origin */,
+                     string16 /* data */)
+
+
 // When the guest navigates, the browser process informs the embedder through
 // the BrowserPluginMsg_DidNavigate message.
 IPC_MESSAGE_CONTROL2(BrowserPluginMsg_DidNavigate,