Run VDA::Decode on GPU IO thread if VDA supports it.

content/common/gpu/media/video_decode_accelerator_impl.cc

Index: content/common/gpu/media/video_decode_accelerator_impl.cc
diff --git a/content/common/gpu/media/video_decode_accelerator_impl.cc b/content/common/gpu/media/video_decode_accelerator_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3c3584ba219ef8248e2af5c85d74abd66a2b8aa5
--- /dev/null
+++ b/content/common/gpu/media/video_decode_accelerator_impl.cc
@@ -0,0 +1,15 @@
+// Copyright (c) 2013 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.
+
+#include "content/common/gpu/media/video_decode_accelerator_impl.h"
+
+namespace content {
+
+VideoDecodeAcceleratorImpl::VideoDecodeAcceleratorImpl() {}
+
+VideoDecodeAcceleratorImpl::~VideoDecodeAcceleratorImpl() {}
+
+bool VideoDecodeAcceleratorImpl::CanDecodeOnIOThread() { return false; }
+
+}  // namespace content