Reland: Introduce GpuVideoDecodeAcceleratorFactory.

content/common/gpu/media/vt_video_decode_accelerator_mac.h

Index: content/common/gpu/media/vt_video_decode_accelerator_mac.h
diff --git a/content/common/gpu/media/vt_video_decode_accelerator_mac.h b/content/common/gpu/media/vt_video_decode_accelerator_mac.h
index c3e75e9e860b6fe2c562aa99fca9e61b6d1c4f6b..e3c0973fa6823687b15f9e00e856179d5751bc0f 100644
--- a/content/common/gpu/media/vt_video_decode_accelerator_mac.h
+++ b/content/common/gpu/media/vt_video_decode_accelerator_mac.h
@@ -17,6 +17,7 @@
 #include "base/message_loop/message_loop.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_checker.h"
+#include "content/common/gpu/media/gpu_video_decode_accelerator_helpers.h"
 #include "content/common/gpu/media/vt_mac.h"
 #include "media/filters/h264_parser.h"
 #include "media/video/h264_poc.h"
@@ -35,8 +36,9 @@ bool InitializeVideoToolbox();
 class VTVideoDecodeAccelerator : public media::VideoDecodeAccelerator {
  public:
   explicit VTVideoDecodeAccelerator(
-      const MakeContextCurrentCallback& make_context_current,
-      const BindImageCallback& bind_image);
+      const MakeGLContextCurrentCallback& make_context_current_cb,
+      const BindGLImageCallback& bind_image_cb);
+
   ~VTVideoDecodeAccelerator() override;
 
   // VideoDecodeAccelerator implementation.
@@ -48,7 +50,10 @@ class VTVideoDecodeAccelerator : public media::VideoDecodeAccelerator {
   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;
 
   // Called by OutputThunk() when VideoToolbox finishes decoding a frame.
   void Output(
@@ -188,8 +193,9 @@ class VTVideoDecodeAccelerator : public media::VideoDecodeAccelerator {
   //
   // GPU thread state.
   //
-  MakeContextCurrentCallback make_context_current_;
-  BindImageCallback bind_image_;
+  MakeGLContextCurrentCallback make_context_current_cb_;
+  BindGLImageCallback bind_image_cb_;
+
   media::VideoDecodeAccelerator::Client* client_;
   State state_;