Fix a crash in mus::GpuService

base/threading/thread_restrictions.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 BASE_THREADING_THREAD_RESTRICTIONS_H_
 #define BASE_THREADING_THREAD_RESTRICTIONS_H_
 
 #include "base/base_export.h"
 #include "base/macros.h"
 
@@ skipping 46 matching lines @@
 class GpuChannelHost;
 }
 namespace mojo {
 namespace common {
 class MessagePumpMojo;
 }
 }
 namespace mus {
 class CommandBufferClientImpl;
 class CommandBufferLocal;
+class GpuService;
 class GpuState;
 }
 namespace net {
 class NetworkChangeNotifierMac;
 namespace internal {
 class AddressTrackerLinux;
 }
 }
 
 namespace remoting {
@@ skipping 129 matching lines @@
   friend class MessagePumpDefault;
   friend class SequencedWorkerPool;
   friend class SimpleThread;
   friend class Thread;
   friend class ThreadTestHelper;
   friend class PlatformThread;
   friend class android::JavaHandlerThread;
   friend class mojo::common::MessagePumpMojo;
   friend class mus::CommandBufferClientImpl;
   friend class mus::CommandBufferLocal;
+  friend class mus::GpuService;                   // http://crbug.com/620058
   friend class mus::GpuState;
 
   // END ALLOWED USAGE.
   // BEGIN USAGE THAT NEEDS TO BE FIXED.
   friend class ::chromeos::BlockingMethodCaller;  // http://crbug.com/125360
   friend class ::chromeos::system::StatisticsProviderImpl;  // http://crbug.com/125385
   friend class chrome_browser_net::Predictor;     // http://crbug.com/78451
   friend class
       content::BrowserGpuChannelHostFactory;      // http://crbug.com/125248
   friend class
@@ skipping 38 matching lines @@
 
     DISALLOW_COPY_AND_ASSIGN(ScopedAllowWait);
   };
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ThreadRestrictions);
 };
 
 }  // namespace base
 
 #endif  // BASE_THREADING_THREAD_RESTRICTIONS_H_