Reland: Introduce GpuVideoDecodeAcceleratorFactory.

media/video/video_decode_accelerator.cc

Index: media/video/video_decode_accelerator.cc
diff --git a/media/video/video_decode_accelerator.cc b/media/video/video_decode_accelerator.cc
index f99787a6fd0dc532aa48a907f32d8d196dfb0c2a..00ae88c1d1ca059e082f3be9744dae7aea84e98b 100644
--- a/media/video/video_decode_accelerator.cc
+++ b/media/video/video_decode_accelerator.cc
@@ -34,9 +34,11 @@ void VideoDecodeAccelerator::SetCdm(int cdm_id) {
   NOTREACHED() << "By default CDM is not supported.";
 }
 
-bool VideoDecodeAccelerator::CanDecodeOnIOThread() {
-  // GPU process subclasses must override this.
-  LOG(FATAL) << "This should only get called in the GPU process";
+bool VideoDecodeAccelerator::TryToSetupDecodeOnSeparateThread(
+    const base::WeakPtr<Client>& decode_client,
+    const scoped_refptr<base::SingleThreadTaskRunner>& decode_task_runner) {
+  // Implementations in the process that VDA runs in must override this.
+  LOG(FATAL) << "This may only be called in the same process as VDA impl.";
   return false;  // not reached
 }