Introduce GpuVideoDecodeAcceleratorFactory.

content/common/gpu/media/dxva_video_decode_accelerator_win.cc

Index: content/common/gpu/media/dxva_video_decode_accelerator_win.cc
diff --git a/content/common/gpu/media/dxva_video_decode_accelerator_win.cc b/content/common/gpu/media/dxva_video_decode_accelerator_win.cc
index cb1841b399715688307a98105ccbd84df1da9b32..877f20916e04bcc1eb1dd9bd18e4e8cd83452f09 100644
--- a/content/common/gpu/media/dxva_video_decode_accelerator_win.cc
+++ b/content/common/gpu/media/dxva_video_decode_accelerator_win.cc
@@ -651,8 +651,8 @@ DXVAVideoDecodeAccelerator::PendingSampleInfo::PendingSampleInfo(
 DXVAVideoDecodeAccelerator::PendingSampleInfo::~PendingSampleInfo() {}
 
 DXVAVideoDecodeAccelerator::DXVAVideoDecodeAccelerator(
-    const base::Callback<bool(void)>& make_context_current,
-    gfx::GLContext* gl_context)
+    const gpu_vda_helpers::GetGLContextCb& get_gl_context_cb,
+    const gpu_vda_helpers::MakeGLContextCurrentCb& make_context_current_cb)
     : client_(NULL),
       dev_manager_reset_token_(0),
       dx11_dev_manager_reset_token_(0),
@@ -661,16 +661,17 @@ DXVAVideoDecodeAccelerator::DXVAVideoDecodeAccelerator(
       pictures_requested_(false),
       inputs_before_decode_(0),
       sent_drain_message_(false),
-      make_context_current_(make_context_current),
+      get_gl_context_cb_(get_gl_context_cb),
+      make_context_current_cb_(make_context_current_cb),
       codec_(media::kUnknownVideoCodec),
       decoder_thread_("DXVAVideoDecoderThread"),
       pending_flush_(false),
       use_dx11_(false),
       use_keyed_mutex_(false),
       dx11_video_format_converter_media_type_needs_init_(true),
-      gl_context_(gl_context),
       using_angle_device_(false),
       weak_this_factory_(this) {
+  DCHECK(!get_gl_context_cb_.is_null());
   weak_ptr_ = weak_this_factory_.GetWeakPtr();
   memset(&input_stream_info_, 0, sizeof(input_stream_info_));
   memset(&output_stream_info_, 0, sizeof(output_stream_info_));
@@ -1106,7 +1107,9 @@ void DXVAVideoDecodeAccelerator::Destroy() {
   delete this;
 }
 
-bool DXVAVideoDecodeAccelerator::CanDecodeOnIOThread() {
+bool DXVAVideoDecodeAccelerator::TryInitializeDecodeOnSeparateThread(
+    const base::WeakPtr<Client>& decode_client,
+    const scoped_refptr<base::SingleThreadTaskRunner>& decode_task_runner) {
   return false;
 }
 
@@ -1291,15 +1294,16 @@ bool DXVAVideoDecodeAccelerator::CheckDecoderDxvaSupport() {
     DVLOG(1) << "Failed to set Low latency mode on decoder. Error: " << hr;
   }
 
+  auto gl_context = get_gl_context_cb_.Run();
+  RETURN_ON_FAILURE(gl_context, "Couldn't get GL context", false);
+
   // The decoder should use DX11 iff
   // 1. The underlying H/W decoder supports it.
   // 2. We have a pointer to the MFCreateDXGIDeviceManager function needed for
   //    this. This should always be true for Windows 8+.
   // 3. ANGLE is using DX11.
-  DCHECK(gl_context_);
   if (create_dxgi_device_manager_ &&
-      (gl_context_->GetGLRenderer().find("Direct3D11") !=
-           std::string::npos)) {
+      (gl_context->GetGLRenderer().find("Direct3D11") != std::string::npos)) {
     UINT32 dx11_aware = 0;
     attributes->GetUINT32(MF_SA_D3D11_AWARE, &dx11_aware);
     use_dx11_ = !!dx11_aware;
@@ -1501,8 +1505,9 @@ void DXVAVideoDecodeAccelerator::ProcessPendingSamples() {
   if (!output_picture_buffers_.size())
     return;
 
-  RETURN_AND_NOTIFY_ON_FAILURE(make_context_current_.Run(),
-      "Failed to make context current", PLATFORM_FAILURE,);
+  RETURN_AND_NOTIFY_ON_FAILURE(make_context_current_cb_.Run(),
+                               "Failed to make context current",
+                               PLATFORM_FAILURE, );
 
   OutputBuffers::iterator index;
 
@@ -2000,8 +2005,9 @@ void DXVAVideoDecodeAccelerator::CopySurfaceComplete(
   if (picture_buffer->available())
     return;
 
-  RETURN_AND_NOTIFY_ON_FAILURE(make_context_current_.Run(),
-      "Failed to make context current", PLATFORM_FAILURE,);
+  RETURN_AND_NOTIFY_ON_FAILURE(make_context_current_cb_.Run(),
+                               "Failed to make context current",
+                               PLATFORM_FAILURE, );
 
   DCHECK(!output_picture_buffers_.empty());