Mojo: add support for disallowing sync calls for a process.

mojo/public/cpp/bindings/lib/interface_endpoint_client.cc

 // Copyright 2015 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 "mojo/public/cpp/bindings/lib/interface_endpoint_client.h"
 
 #include <stdint.h>
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "mojo/public/cpp/bindings/associated_group.h"
 #include "mojo/public/cpp/bindings/lib/interface_endpoint_controller.h"
 #include "mojo/public/cpp/bindings/lib/multiplex_router.h"
+#include "mojo/public/cpp/bindings/sync_call_restrictions.h"
 
 namespace mojo {
 namespace internal {
 
 // ----------------------------------------------------------------------------
 
 namespace {
 
 void DCheckIfInvalid(const base::WeakPtr<InterfaceEndpointClient>& client,
                    const std::string& message) {
@@ skipping 192 matching lines @@
   bool is_sync = message->has_flag(kMessageIsSync);
   if (!controller_->SendMessage(message))
     return false;
 
   if (!is_sync) {
     // We assume ownership of |responder|.
     async_responders_[request_id] = base::WrapUnique(responder);
     return true;
   }
 
+  SyncCallRestrictions::AssertSyncCallAllowed();
+
   bool response_received = false;
   std::unique_ptr<MessageReceiver> sync_responder(responder);
   sync_responses_.insert(std::make_pair(
       request_id, base::WrapUnique(new SyncResponseInfo(&response_received))));
 
   base::WeakPtr<InterfaceEndpointClient> weak_self =
       weak_ptr_factory_.GetWeakPtr();
   controller_->SyncWatch(&response_received);
   // Make sure that this instance hasn't been destroyed.
   if (weak_self) {
@@ skipping 62 matching lines @@
   } else {
     if (!incoming_receiver_)
       return false;
 
     return incoming_receiver_->Accept(message);
   }
 }
 
 }  // namespace internal
 }  // namespace mojo