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 563684b4b10e63ed842fbd17dfc4ae0364ce6d7f..d61fb4c2aa4c2bb6c0492bcd4a16b615631ee703 100644
--- a/content/common/browser_plugin_messages.h
+++ b/content/common/browser_plugin_messages.h
@@ -125,6 +125,35 @@ IPC_SYNC_MESSAGE_ROUTED2_0(BrowserPluginHostMsg_ResizeGuest,
 // -----------------------------------------------------------------------------
 // These messages are from the browser process to the embedder.
 
+// Once the swapped out guest RenderView has been created in the embedder render
+// process, the browser process informs the embedder of its routing ID.
+IPC_MESSAGE_CONTROL2(BrowserPluginMsg_GuestContentWindowReady,
+                     int /* instance_id */,
+                     int /* source_routing_id */)
+
+IPC_STRUCT_BEGIN(BrowserPluginMsg_ReceiveMessage_Params)
+  // The routing ID of the swapped out RenderView of the guest
+  // in the embedder render process.
+  IPC_STRUCT_MEMBER(int, source_routing_id)
+  // The origin of the source frame.
+  IPC_STRUCT_MEMBER(string16, source_origin)
+  // The identifier of the source frame in the source process.
+  IPC_STRUCT_MEMBER(int, source_frame_id)
+  // The identifier of the target frame in the target process.
+  IPC_STRUCT_MEMBER(int, target_frame_id)
+  // The serialized script value.
+  IPC_STRUCT_MEMBER(string16, data)
+IPC_STRUCT_END()
+
+// When a guest render process responds to its embedder's message,
+// the message is carried in BrowserPluginMsg_ReceiveMessage's paylod.
+// This IPC targets a particular browser plugin with the embedder
+// to fire a MessageEvent on its element.
+IPC_MESSAGE_CONTROL2(BrowserPluginMsg_ReceiveMessage,
+                     int /* instance_id */,
+                     BrowserPluginMsg_ReceiveMessage_Params /* params */)
+
+
 // When the guest navigates, the browser process informs the embedder through
 // the BrowserPluginMsg_DidNavigate message.
 IPC_MESSAGE_CONTROL3(BrowserPluginMsg_DidNavigate,