Avoid GpuPreferences exposed in content public gpu interface

content/gpu/gpu_child_thread.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_GPU_GPU_CHILD_THREAD_H_
 #define CONTENT_GPU_GPU_CHILD_THREAD_H_
 
 #include <stdint.h>
 
 #include <queue>
@@ skipping 38 matching lines @@
 
 // The main thread of the GPU child process. There will only ever be one of
 // these per process. It does process initialization and shutdown. It forwards
 // IPC messages to GpuChannelManager, which is responsible for issuing rendering
 // commands to the GPU.
 class GpuChildThread : public ChildThreadImpl,
                        public GpuChannelManagerDelegate {
  public:
   typedef std::queue<IPC::Message*> DeferredMessages;
 
+  // Returns the one gpu thread for this process. Note that this can only
+  // be accessed when running on the gpu thread itself.
+  static GpuChildThread* current();
+
   GpuChildThread(GpuWatchdogThread* gpu_watchdog_thread,
                  bool dead_on_arrival,
                  const gpu::GPUInfo& gpu_info,
                  const DeferredMessages& deferred_messages,
                  GpuMemoryBufferFactory* gpu_memory_buffer_factory,
                  gpu::SyncPointManager* sync_point_manager);
 
   GpuChildThread(const gpu::GpuPreferences& gpu_preferences,
                  const InProcessChildThreadParams& params,
                  GpuMemoryBufferFactory* gpu_memory_buffer_factory,
                  gpu::SyncPointManager* sync_point_manager);
 
   ~GpuChildThread() override;
 
   void Shutdown() override;
 
   void Init(const base::Time& process_start_time);
   void StopWatchdog();
 
+  gpu::GpuPreferences gpu_preferences() { return gpu_preferences_; }
+
  private:
   // ChildThread overrides.
   bool Send(IPC::Message* msg) override;
   bool OnControlMessageReceived(const IPC::Message& msg) override;
   bool OnMessageReceived(const IPC::Message& msg) override;
 
   // GpuChannelManagerDelegate implementation.
   void SetActiveURL(const GURL& url) override;
   void AddSubscription(int32_t client_id, unsigned int target) override;
   void DidCreateOffscreenContext(const GURL& active_url) override;
@@ skipping 92 matching lines @@
 
   // Bindings to the mojom::ProcessControl impl.
   mojo::BindingSet<mojom::ProcessControl> process_control_bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChildThread);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_GPU_GPU_CHILD_THREAD_H_