[mojo] Add CreateSharedBuffer method to Broker.

mojo/edk/system/broker_state.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/edk/system/broker_state.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/rand_util.h"
 #include "mojo/edk/embedder/embedder_internal.h"
 #include "mojo/edk/embedder/platform_channel_pair.h"
+#include "mojo/edk/embedder/platform_shared_buffer.h"
+#include "mojo/edk/embedder/platform_support.h"
 #include "mojo/edk/system/child_broker_host.h"
 #include "mojo/edk/system/message_pipe_dispatcher.h"
 #include "mojo/edk/system/routed_raw_channel.h"
 
 namespace mojo {
 namespace edk {
 
 BrokerState* BrokerState::GetInstance() {
   return base::Singleton<
       BrokerState, base::LeakySingletonTraits<BrokerState>>::get();
@@ skipping 34 matching lines @@
   for (size_t i = 0; i < count; ++i) {
     auto it = token_map_.find(tokens[i]);
     if (it == token_map_.end()) {
       DLOG(WARNING) << "TokenToHandle didn't find token.";
     } else {
       handles[i].handle = it->second;
       token_map_.erase(it);
     }
   }
 }
+#else
+scoped_refptr<PlatformSharedBuffer> BrokerState::CreateSharedBuffer(
+    size_t num_bytes) {
+  return internal::g_platform_support->CreateSharedBuffer(num_bytes);
+}
 #endif
 
 void BrokerState::ConnectMessagePipe(uint64_t pipe_id,
                                      MessagePipeDispatcher* message_pipe) {
   DCHECK(internal::g_io_thread_task_runner->RunsTasksOnCurrentThread());
   base::AutoLock auto_lock(lock_);
   if (pending_connects_.find(pipe_id) != pending_connects_.end()) {
     // Both ends of the message pipe are in this process.
     if (!in_process_pipes_channel1_) {
       PlatformChannelPair channel_pair;
@@ skipping 159 matching lines @@
   // then when it's read it returns no messages because it doesn't have the
   // channel yet.
   message_pipe->GotNonTransferableChannel(raw_channel->channel());
   // The above call could have caused |CloseMessagePipe| to be called.
   if (connected_pipes_.find(message_pipe) != connected_pipes_.end())
     raw_channel->AddRoute(pipe_id, message_pipe);
 }
 
 }  // namespace edk
 }  // namespace mojo