Make gpu black list work again on Linux

content/renderer/render_thread_impl.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 CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 314 matching lines @@
 #endif
 
   VideoCaptureImplManager* video_capture_impl_manager() const {
     return vc_manager_.get();
   }
 
   // Get the GPU channel. Returns NULL if the channel is not established or
   // has been lost.
   GpuChannelHost* GetGpuChannel();
 
+  // Send a sync message to the browser process to know whether a gpu process is
+  // alive.
+  bool HasGpuProcess();
+
   // Returns a SingleThreadTaskRunner instance corresponding to the message loop
   // of the thread on which file operations should be run. Must be called
   // on the renderer's main thread.
   scoped_refptr<base::SingleThreadTaskRunner> GetFileThreadMessageLoopProxy();
 
   // Returns a SingleThreadTaskRunner instance corresponding to the message loop
   // of the thread on which media operations should be run. Must be called
   // on the renderer's main thread.
   scoped_refptr<base::SingleThreadTaskRunner> GetMediaThreadTaskRunner();
 
@@ skipping 357 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_