Reland: Introduce GpuVideoDecodeAcceleratorFactory.

content/common/gpu/media/fake_video_decode_accelerator.h

Index: content/common/gpu/media/fake_video_decode_accelerator.h
diff --git a/content/common/gpu/media/fake_video_decode_accelerator.h b/content/common/gpu/media/fake_video_decode_accelerator.h
index 7dcbfda2e772153da26f2f3b25b5458cb69e7b93..10d47822b45faac4a0d1bcc3c5041138751903cc 100644
--- a/content/common/gpu/media/fake_video_decode_accelerator.h
+++ b/content/common/gpu/media/fake_video_decode_accelerator.h
@@ -13,6 +13,7 @@
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "content/common/content_export.h"
+#include "content/common/gpu/media/gpu_video_decode_accelerator_helpers.h"
 #include "media/video/video_decode_accelerator.h"
 #include "ui/gfx/geometry/size_f.h"
 #include "ui/gl/gl_context.h"
@@ -23,9 +24,8 @@ class CONTENT_EXPORT FakeVideoDecodeAccelerator
     : public media::VideoDecodeAccelerator {
  public:
   FakeVideoDecodeAccelerator(
-      gfx::GLContext* gl,
-      gfx::Size size,
-      const base::Callback<bool(void)>& make_context_current);
+      const gfx::Size& size,
+      const MakeGLContextCurrentCallback& make_context_current_cb);
   ~FakeVideoDecodeAccelerator() override;
 
   bool Initialize(const Config& config, Client* client) override;
@@ -36,7 +36,10 @@ class CONTENT_EXPORT FakeVideoDecodeAccelerator
   void Flush() override;
   void Reset() override;
   void Destroy() override;
-  bool CanDecodeOnIOThread() override;
+  bool TryToSetupDecodeOnSeparateThread(
+      const base::WeakPtr<Client>& decode_client,
+      const scoped_refptr<base::SingleThreadTaskRunner>& decode_task_runner)
+      override;
 
  private:
   void DoPictureReady();
@@ -49,8 +52,7 @@ class CONTENT_EXPORT FakeVideoDecodeAccelerator
   Client* client_;
 
   // Make our context current before running any GL entry points.
-  base::Callback<bool(void)> make_context_current_;
-  gfx::GLContext* gl_;
+  MakeGLContextCurrentCallback make_context_current_cb_;
 
   // Output picture size.
   gfx::Size frame_buffer_size_;