media: Add GpuMojoMediaClient.

content/gpu/gpu_service_factory.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 CONTENT_GPU_GPU_SERVICE_FACTORY_H_
 #define CONTENT_GPU_GPU_SERVICE_FACTORY_H_
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "base/single_thread_task_runner.h"
 #include "content/child/service_factory.h"
 
+namespace media {
+class MediaGpuChannelManager;
+}
+
 namespace content {
 
 // Customization of ServiceFactory for the GPU process.
 class GpuServiceFactory : public ServiceFactory {
  public:
-  GpuServiceFactory();
+  explicit GpuServiceFactory(
+      base::WeakPtr<media::MediaGpuChannelManager> media_gpu_channel_manager);
   ~GpuServiceFactory() override;
 
   // ServiceFactory overrides:
   void RegisterServices(ServiceMap* services) override;
 
  private:
+  // Task runner we were constructed on, and that |media_gpu_channel_manager_|
+  // must be accessed from (the GPU main thread task runner). We expect
+  // RegisterServices() to be called on this task runner as well, but the
+  // implementation doesn't care.
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  base::WeakPtr<media::MediaGpuChannelManager> media_gpu_channel_manager_;

[xhwang, 2016/11/24 07:02:11]

You can probably guard these two with #if
defined(ENABLE_MOJO_MEDIA_IN_GPU_PROCESS) as well, then compiler won't complain.
The downside of this is that the constructor would be a bit messy.

   DISALLOW_COPY_AND_ASSIGN(GpuServiceFactory);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_GPU_GPU_SERVICE_FACTORY_H_