Allow renderer to create pepper ResourceHosts in the browser

ppapi/proxy/ppapi_messages.h

Index: ppapi/proxy/ppapi_messages.h
diff --git a/ppapi/proxy/ppapi_messages.h b/ppapi/proxy/ppapi_messages.h
index 48a10fd6102c0cc2b1ba6f0e623c00c1d5d79c9c..66f7615084bde4625fe9f57991f238c24cdb494f 100644
--- a/ppapi/proxy/ppapi_messages.h
+++ b/ppapi/proxy/ppapi_messages.h
@@ -1296,6 +1296,28 @@ IPC_SYNC_MESSAGE_CONTROL2_2(PpapiHostMsg_ResourceSyncCall,
     ppapi::proxy::ResourceMessageReplyParams /* reply_params */,
     IPC::Message /* reply_msg */)
 
+// This message is sent from the renderer to the browser when it wants to create
+// a ResourceHost in the browser. It contains the process ID of the plugin and
+// the instance of the plugin for which to create the resource for. params
+// contains the sequence number for the message to track the response.
+// The nested message is a ResourceHost creation message.
+IPC_MESSAGE_CONTROL4(
+    PpapiHostMsg_CreateResourceHostFromHost,
+    int /* child_process_id */,
+    ppapi::proxy::ResourceMessageCallParams /* params */,
+    PP_Instance /* instance */,
+    IPC::Message /* nested_msg */)
+
+// This message is sent from the browser to the renderer when it has created a
+// ResourceHost for the renderer. It contains the sequence number that was sent
+// in the request and the ID of the pending ResourceHost which was created in
+// the browser. This ID is only useful for the plugin which can attach to the
+// ResourceHost in the browser.
+IPC_MESSAGE_CONTROL2(
+    PpapiHostMsg_CreateResourceHostFromHostReply,
+    int32_t /* sequence */,
+    int /* pending_host_id */)
+
 //-----------------------------------------------------------------------------
 // Messages for resources using call/reply above.