PPAPI: Implement synchronous postMessage

content/renderer/pepper/pepper_plugin_instance_impl.cc

 // 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.
 
 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 1150 matching lines @@
   if (cursor_)
     *cursor_info = *cursor_;
   return rv;
 }
 
 void PepperPluginInstanceImpl::HandleMessage(ScopedPPVar message) {
   TRACE_EVENT0("ppapi", "PepperPluginInstanceImpl::HandleMessage");
   ppapi::proxy::HostDispatcher* dispatcher =
       ppapi::proxy::HostDispatcher::GetForInstance(pp_instance());
   if (!dispatcher || (message.get().type == PP_VARTYPE_OBJECT)) {
-    // The dispatcher should always be valid, and the browser should never send
-    // an 'object' var over PPP_Messaging.
+    // The dispatcher should always be valid, and MessageChannel should never
+    // send an 'object' var over PPP_Messaging.
     NOTREACHED();
     return;
   }
   dispatcher->Send(new PpapiMsg_PPPMessaging_HandleMessage(
       ppapi::API_ID_PPP_MESSAGING,
       pp_instance(),
       ppapi::proxy::SerializedVarSendInputShmem(dispatcher, message.get(),
                                                 pp_instance())));
 }
 
+bool PepperPluginInstanceImpl::HandleBlockingMessage(ScopedPPVar message,
+                                                     ScopedPPVar* result) {
+  TRACE_EVENT0("ppapi", "PepperPluginInstanceImpl::HandleBlockingMessage");
+  ppapi::proxy::HostDispatcher* dispatcher =
+      ppapi::proxy::HostDispatcher::GetForInstance(pp_instance());
+  if (!dispatcher || (message.get().type == PP_VARTYPE_OBJECT)) {
+    // The dispatcher should always be valid, and MessageChannel should never
+    // send an 'object' var over PPP_Messaging.
+    NOTREACHED();
+    return false;
+  }
+  ppapi::proxy::ReceiveSerializedVarReturnValue msg_reply;
+  bool was_handled = false;
+  dispatcher->Send(new PpapiMsg_PPPMessageHandler_HandleBlockingMessage(
+      ppapi::API_ID_PPP_MESSAGING,
+      pp_instance(),
+      ppapi::proxy::SerializedVarSendInputShmem(dispatcher, message.get(),
+                                                pp_instance()),
+      &msg_reply,
+      &was_handled));
+  *result = ScopedPPVar(ScopedPPVar::PassRef(), msg_reply.Return(dispatcher));
+  TRACE_EVENT0("ppapi",
+               "PepperPluginInstanceImpl::HandleBlockingMessage return.");
+  return was_handled;
+}
+
 PP_Var PepperPluginInstanceImpl::GetInstanceObject() {
   // Keep a reference on the stack. See NOTE above.
   scoped_refptr<PepperPluginInstanceImpl> ref(this);
 
   // If the plugin supports the private instance interface, try to retrieve its
   // instance object.
   if (LoadPrivateInterface())
     return plugin_private_interface_->GetInstanceObject(pp_instance());
   return PP_MakeUndefined();
 }
@@ skipping 2081 matching lines @@
     // Running out-of-process. Initiate an IPC call to notify the plugin
     // process.
     ppapi::proxy::HostDispatcher* dispatcher =
         ppapi::proxy::HostDispatcher::GetForInstance(pp_instance());
     dispatcher->Send(new PpapiMsg_PPPInstance_HandleDocumentLoad(
         ppapi::API_ID_PPP_INSTANCE, pp_instance(), pending_host_id, data));
   }
 }
 
 }  // namespace content