Set simulcastIdx field to zero even if it has no meaning.
Helps to be able to memcmp between 2 parses of the same packet.

R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/30279004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7773 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_format_vp8.cc b/webrtc/modules/rtp_rtcp/source/rtp_format_vp8.cc
index 57ff74f..5202754 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_format_vp8.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_format_vp8.cc
@@ -678,6 +678,7 @@
   parsed_payload->type.Video.height = 0;
   parsed_payload->type.Video.isFirstPacket =
       beginning_of_partition && (partition_id == 0);
+  parsed_payload->type.Video.simulcastIdx = 0;
   parsed_payload->type.Video.codec = kRtpVideoVp8;
   parsed_payload->type.Video.codecHeader.VP8.nonReference =
       (*payload_data & 0x20) ? true : false;  // N bit