Merge VideoDecodeAcceleratorImpl with VideoDecodeAccelerator

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 142dab366c344f3174896340157e6a09d58134cd..a72912cf3059ac777c9314b99fc286baf8d09ad9 100644
--- a/media/video/video_decode_accelerator.cc
+++ b/media/video/video_decode_accelerator.cc
@@ -4,12 +4,20 @@
 
 #include "media/video/video_decode_accelerator.h"
 
+#include "base/logging.h"
+
 namespace media {
 
 VideoDecodeAccelerator::~VideoDecodeAccelerator() {}
 
+bool VideoDecodeAccelerator::CanDecodeOnIOThread() {
+  // GPU process subclasses must override this.
+  LOG(FATAL) << "This should only get called in the GPU process";
+  return false;  // not reached
 }
 
+} // namespace media
+
 namespace base {
 
 void DefaultDeleter<media::VideoDecodeAccelerator>::operator()(