PPAPI: Implement synchronous postMessage

content/renderer/pepper/pepper_plugin_instance_impl.h

 // Copyright (c) 2012 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 CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_INSTANCE_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_INSTANCE_IMPL_H_
 
 #include <list>
 #include <set>
 #include <string>
@@ skipping 283 matching lines @@
   // Switches between fullscreen and normal mode. The transition is
   // asynchronous. WebKit will trigger corresponding VewChanged calls.
   // Returns true on success, false on failure (e.g. trying to enter fullscreen
   // when not processing a user gesture or trying to set fullscreen when
   // already in fullscreen mode).
   bool SetFullscreen(bool fullscreen);
 
   // Send the message on to the plugin.
   void HandleMessage(ppapi::ScopedPPVar message);
 
+  // Send the message synchronously to the plugin, and get a result. Returns
+  // true if the plugin handled the message, false if it didn't. The plugin
+  // won't handle the message if it has not registered a PPP_MessageHandler.
+  bool HandleBlockingMessage(ppapi::ScopedPPVar message,
+                             ppapi::ScopedPPVar* result);
+
   // Returns true if the plugin is processing a user gesture.
   bool IsProcessingUserGesture();
 
   // Returns the user gesture token to use for creating a WebScopedUserGesture,
   // if IsProcessingUserGesture returned true.
   blink::WebUserGestureToken CurrentUserGestureToken();
 
   // A mouse lock request was pending and this reports success or failure.
   void OnLockMouseACK(bool succeeded);
   // A mouse lock was in place, but has been lost.
@@ skipping 571 matching lines @@
   base::WeakPtrFactory<PepperPluginInstanceImpl> view_change_weak_ptr_factory_;
   base::WeakPtrFactory<PepperPluginInstanceImpl> weak_factory_;
 
   friend class PpapiPluginInstanceTest;
   DISALLOW_COPY_AND_ASSIGN(PepperPluginInstanceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_INSTANCE_IMPL_H_