[dxvavda] Mark NV12 textures as allowing overlays.

media/gpu/dxva_picture_buffer_win.cc

Index: media/gpu/dxva_picture_buffer_win.cc
diff --git a/media/gpu/dxva_picture_buffer_win.cc b/media/gpu/dxva_picture_buffer_win.cc
index 44f27f950a43c5f2bf2da1c6493deae677d50fbf..bcaa177609d9c66acf3e8491c76dc14a0aba77b8 100644
--- a/media/gpu/dxva_picture_buffer_win.cc
+++ b/media/gpu/dxva_picture_buffer_win.cc
@@ -370,6 +370,10 @@ bool PbufferPictureBuffer::CopySurfaceComplete(
   return true;
 }
 
+bool PbufferPictureBuffer::AllowOverlay() const {
+  return false;
+}
+
 PbufferPictureBuffer::PbufferPictureBuffer(const PictureBuffer& buffer)
     : DXVAPictureBuffer(buffer),
       decoding_surface_(NULL),
@@ -508,6 +512,10 @@ bool EGLStreamPictureBuffer::BindSampleToTexture(
   return true;
 }
 
+bool EGLStreamPictureBuffer::AllowOverlay() const {
+  return true;
+}
+
 EGLStreamCopyPictureBuffer::EGLStreamCopyPictureBuffer(
     const PictureBuffer& buffer)
     : DXVAPictureBuffer(buffer), stream_(nullptr) {}
@@ -671,4 +679,8 @@ bool EGLStreamCopyPictureBuffer::ReusePictureBuffer() {
   return true;
 }
 
+bool EGLStreamCopyPictureBuffer::AllowOverlay() const {
+  return true;
+}
+
 }  // namespace media