Reland of Rename RTPVideoHeader.isFirstPacket to .is_first_packet_in_frame.

webrtc/modules/video_coding/packet.h

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_MODULES_VIDEO_CODING_PACKET_H_
 #define WEBRTC_MODULES_VIDEO_CODING_PACKET_H_
 
+#include "webrtc/base/deprecation.h"
 #include "webrtc/modules/include/module_common_types.h"
 #include "webrtc/modules/video_coding/jitter_buffer_common.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 
 class VCMPacket {
  public:
   VCMPacket();
   VCMPacket(const uint8_t* ptr,
             const size_t size,
             const WebRtcRTPHeader& rtpHeader);
 
   void Reset();
 
   uint8_t payloadType;
   uint32_t timestamp;
   // NTP time of the capture time in local timebase in milliseconds.
   int64_t ntp_time_ms_;
   uint16_t seqNum;
   const uint8_t* dataPtr;
   size_t sizeBytes;
   bool markerBit;
   int timesNacked;
 
   FrameType frameType;
   VideoCodecType codec;
 
-  bool isFirstPacket;                // Is this first packet in a frame.
+  union {
+    RTC_DEPRECATED bool isFirstPacket;  // Is this first packet in a frame.
+    bool is_first_packet_in_frame;
+  };
   VCMNaluCompleteness completeNALU;  // Default is kNaluIncomplete.
   bool insertStartCode;  // True if a start code should be inserted before this
                          // packet.
   int width;
   int height;
   RTPVideoHeader video_header;
 
  protected:
   void CopyCodecSpecifics(const RTPVideoHeader& videoHeader);
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_VIDEO_CODING_PACKET_H_