[mojo] Add CreateSharedBuffer method to Broker.

mojo/edk/system/broker_state.h

 // 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.
 
 #ifndef MOJO_EDK_SYSTEM_BROKER_STATE_H_
 #define MOJO_EDK_SYSTEM_BROKER_STATE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 22 matching lines @@
   // Broker implementation:
 #if defined(OS_WIN)
   void CreatePlatformChannelPair(ScopedPlatformHandle* server,
                                  ScopedPlatformHandle* client) override;
   void HandleToToken(const PlatformHandle* platform_handles,
                      size_t count,
                      uint64_t* tokens) override;
   void TokenToHandle(const uint64_t* tokens,
                      size_t count,
                      PlatformHandle* handles) override;
+#else
+  scoped_refptr<PlatformSharedBuffer> CreateSharedBuffer(
+      size_t num_bytes) override;
 #endif
+
   void ConnectMessagePipe(uint64_t pipe_id,
                           MessagePipeDispatcher* message_pipe) override;
   void CloseMessagePipe(uint64_t pipe_id,
                         MessagePipeDispatcher* message_pipe) override;
 
   // Called by ChildBrokerHost on construction and destruction.
   void ChildBrokerHostCreated(ChildBrokerHost* child_broker_host);
   void ChildBrokerHostDestructed(ChildBrokerHost* child_broker_host);
 
   // These are called by ChildBrokerHost as they dispatch IPCs from ChildBroker.
@@ skipping 58 matching lines @@
   RoutedRawChannel* in_process_pipes_channel1_;
   RoutedRawChannel* in_process_pipes_channel2_;
 
   DISALLOW_COPY_AND_ASSIGN(BrokerState);
 };
 
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_BROKER_STATE_H_