Make gpu black list work again on Linux

content/browser/renderer_host/gpu_message_filter.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_BROWSER_RENDERER_HOST_GPU_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_GPU_MESSAGE_FILTER_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 18 matching lines @@
 
  private:
   friend class BrowserThread;
   friend class base::DeleteHelper<GpuMessageFilter>;
 
   ~GpuMessageFilter() override;
 
   // Message handlers called on the browser IO thread:
   void OnEstablishGpuChannel(CauseForGpuLaunch,
                              IPC::Message* reply);
+  void OnHasGpuProcess(IPC::Message* reply);
   // Helper callbacks for the message handlers.
   void EstablishChannelCallback(scoped_ptr<IPC::Message> reply,
                                 const IPC::ChannelHandle& channel,
                                 const gpu::GPUInfo& gpu_info);
+  void GetGpuProcessHandlesCallback(
+      scoped_ptr<IPC::Message> reply,
+      const std::list<base::ProcessHandle>& handles);
 
   int gpu_process_id_;
   int render_process_id_;
 
   base::WeakPtrFactory<GpuMessageFilter> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMessageFilter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_GPU_MESSAGE_FILTER_H_