Make PPAPI PostMessage behave asynchronously.

webkit/plugins/ppapi/message_channel.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WEBKIT_PLUGINS_PPAPI_MESSAGE_CHANNEL_H_
 #define WEBKIT_PLUGINS_PPAPI_MESSAGE_CHANNEL_H_
 
+#include "base/task.h"
 #include "third_party/npapi/bindings/npruntime.h"
 #include "webkit/plugins/ppapi/resource.h"
 
 struct PP_Var;
 
 namespace webkit {
 namespace ppapi {
 
 class PluginInstance;
 
@@ skipping 19 matching lines @@
   struct MessageChannelNPObject : public NPObject {
     MessageChannelNPObject();
     ~MessageChannelNPObject();
 
     MessageChannel* message_channel;
   };
 
   explicit MessageChannel(PluginInstance* instance);
   ~MessageChannel();
 
+  // Post a message to the onmessage handler for this channel's instance
+  // asynchronously.
   void PostMessageToJavaScript(PP_Var message_data);
+  // Post a message to the PPP_Instance HandleMessage function for this
+  // channel's instance.
   void PostMessageToNative(PP_Var message_data);
 
   // Return the NPObject* to which we should forward any calls which aren't
   // related to postMessage.  Note that this can be NULL;  it only gets set if
   // there is a scriptable 'InstanceObject' associated with this channel's
   // instance.
   NPObject* passthrough_object() {
     return passthrough_object_;
   }
   void set_passthrough_object(NPObject* passthrough) {
@@ skipping 16 matching lines @@
   // scripting.
   NPObject* passthrough_object_;
 
   // The NPObject we use to expose postMessage to JavaScript.
   MessageChannelNPObject* np_object_;
 
   // An NPVariant referring to the JavaScript function we use to send a message
   // to a JavaScript target.
   NPVariant onmessage_invoker_;
 
+  // Evaluates the JavaScript code for onmessage_invoker_ and makes
+  // it a callable NPVariant for that function.  Returns true on success, false
+  // otherwise.
   bool EvaluateOnMessageInvoker();
 
+  // Post a message to the onmessage handler for this channel's instance
+  // synchronously.  This is used by PostMessageToJavaScript.
+  void PostMessageToJavaScriptImpl(PP_Var message_data);
+  // Post a message to the PPP_Instance HandleMessage function for this
+  // channel's instance.  This is used by PostMessageToNative.
+  void PostMessageToNativeImpl(PP_Var message_data);
+
+  // Ensure pending tasks will not fire after this object is destroyed.
+  ScopedRunnableMethodFactory<MessageChannel> method_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(MessageChannel);
 };
 
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_MESSAGE_CHANNEL_H_