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

content/common/gpu/media/vaapi_video_decode_accelerator.cc

Index: content/common/gpu/media/vaapi_video_decode_accelerator.cc
diff --git a/content/common/gpu/media/vaapi_video_decode_accelerator.cc b/content/common/gpu/media/vaapi_video_decode_accelerator.cc
index cd18574a8d8142d65f6fb5485444a60218d62a25..ca375754a2be66c90c7ad3bfaeec36b773782fa3 100644
--- a/content/common/gpu/media/vaapi_video_decode_accelerator.cc
+++ b/content/common/gpu/media/vaapi_video_decode_accelerator.cc
@@ -44,7 +44,6 @@ VaapiVideoDecodeAccelerator::InputBuffer::~InputBuffer() {
 
 void VaapiVideoDecodeAccelerator::NotifyError(Error error) {
   if (message_loop_ != base::MessageLoop::current()) {
-    DCHECK_EQ(decoder_thread_.message_loop(), base::MessageLoop::current());
     message_loop_->PostTask(FROM_HERE, base::Bind(
         &VaapiVideoDecodeAccelerator::NotifyError, weak_this_, error));
     return;
@@ -242,7 +241,8 @@ VaapiVideoDecodeAccelerator::TFPPicture*
 VaapiVideoDecodeAccelerator::VaapiVideoDecodeAccelerator(
     Display* x_display, GLXContext glx_context,
     Client* client,
-    const base::Callback<bool(void)>& make_context_current)
+    const base::Callback<bool(void)>& make_context_current,
+    const scoped_refptr<base::MessageLoopProxy>& io_message_loop);
     : x_display_(x_display),
       glx_context_(glx_context),
       make_context_current_(make_context_current),
@@ -250,6 +250,7 @@ VaapiVideoDecodeAccelerator::VaapiVideoDecodeAccelerator(
       input_ready_(&lock_),
       surfaces_available_(&lock_),
       message_loop_(base::MessageLoop::current()),
+      io_message_loop_(io_message_loop),
       weak_this_(base::AsWeakPtr(this)),
       client_ptr_factory_(client),
       client_(client_ptr_factory_.GetWeakPtr()),
@@ -411,7 +412,7 @@ void VaapiVideoDecodeAccelerator::TryOutputSurface() {
 
 void VaapiVideoDecodeAccelerator::MapAndQueueNewInputBuffer(
     const media::BitstreamBuffer& bitstream_buffer) {
-  DCHECK_EQ(message_loop_, base::MessageLoop::current());
+  DCHECK_EQ(io_message_loop_, base::MessageLoop::current());
   TRACE_EVENT1("Video Decoder", "MapAndQueueNewInputBuffer", "input_id",
       bitstream_buffer.id());
 
@@ -646,7 +647,7 @@ void VaapiVideoDecodeAccelerator::TryFinishSurfaceSetChange() {
 
 void VaapiVideoDecodeAccelerator::Decode(
     const media::BitstreamBuffer& bitstream_buffer) {
-  DCHECK_EQ(message_loop_, base::MessageLoop::current());
+  DCHECK_EQ(io_message_loop_, base::MessageLoop::current());
 
   TRACE_EVENT1("Video Decoder", "VAVDA::Decode", "Buffer id",
                bitstream_buffer.id());