Add offset support to BitstreamBuffer.

content/renderer/media/rtc_video_decoder.cc

Index: content/renderer/media/rtc_video_decoder.cc
diff --git a/content/renderer/media/rtc_video_decoder.cc b/content/renderer/media/rtc_video_decoder.cc
index 72748696f2ca870022e0fe6d2614c1a6c51e8a66..069f418225ddb88e775ee34db6041b3dd122fd5e 100644
--- a/content/renderer/media/rtc_video_decoder.cc
+++ b/content/renderer/media/rtc_video_decoder.cc
@@ -508,7 +508,7 @@ void RTCVideoDecoder::RequestBufferDecode() {
     // Create a BitstreamBuffer and send to VDA to decode.
     media::BitstreamBuffer bitstream_buffer(
         buffer_data.bitstream_buffer_id, shm_buffer->handle(), buffer_data.size,
-        base::TimeDelta::FromInternalValue(buffer_data.timestamp));
+        0, base::TimeDelta::FromInternalValue(buffer_data.timestamp));
     const bool inserted =
         bitstream_buffers_in_decoder_.insert(
             std::make_pair(bitstream_buffer.id(), shm_buffer.release())).second;