Add support for multiple pixel formats in VideoFrameBuffer

webrtc/common_video/video_frame_buffer.cc

Index: webrtc/common_video/video_frame_buffer.cc
diff --git a/webrtc/common_video/video_frame_buffer.cc b/webrtc/common_video/video_frame_buffer.cc
index 4646bf491f9b745298c9fef6b29d9575b1f15f56..4adce9f6799f2e2b0448214747a76025d9a60b66 100644
--- a/webrtc/common_video/video_frame_buffer.cc
+++ b/webrtc/common_video/video_frame_buffer.cc
@@ -30,6 +30,10 @@ NativeHandleBuffer::NativeHandleBuffer(void* native_handle,
   RTC_DCHECK_GT(height, 0);
 }
 
+VideoFrameBuffer::PixelFormat NativeHandleBuffer::Format() const {
+  return PixelFormat::kNative;
+}
+
 int NativeHandleBuffer::width() const {
   return width_;
 }
@@ -120,13 +124,4 @@ int WrappedI420Buffer::StrideV() const {
   return v_stride_;
 }
 
-void* WrappedI420Buffer::native_handle() const {
-  return nullptr;
-}
-
-rtc::scoped_refptr<VideoFrameBuffer> WrappedI420Buffer::NativeToI420Buffer() {
-  RTC_NOTREACHED();
-  return nullptr;
-}
-
 }  // namespace webrtc