Fixed time moving backwards in the AudioCodingModule.

webrtc/modules/audio_coding/test/TestVADDTX.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 83 matching lines @@
   in_file.FastForward(50);
 
   PCMFile out_file;
   if (append) {
     out_file.Open(out_filename, kOutputFreqHz, "ab");
   } else {
     out_file.Open(out_filename, kOutputFreqHz, "wb");
   }
 
   uint16_t frame_size_samples = in_file.PayloadLength10Ms();
-  uint32_t time_stamp = 0x12345678;
   AudioFrame audio_frame;
   while (!in_file.EndOfFile()) {
     in_file.Read10MsData(audio_frame);
-    audio_frame.timestamp_ = time_stamp;
-    time_stamp += frame_size_samples;
+    audio_frame.timestamp_ = time_stamp_;
+    time_stamp_ += frame_size_samples;
     EXPECT_GE(acm_send_->Add10MsData(audio_frame), 0);
     bool muted;
     acm_receive_->PlayoutData10Ms(kOutputFreqHz, &audio_frame, &muted);
     ASSERT_FALSE(muted);
     out_file.Write10MsData(audio_frame);
   }
 
   in_file.Close();
   out_file.Close();
 
@@ skipping 149 matching lines @@
 
   EXPECT_EQ(0, acm_send_->EnableOpusDtx());
 
   expects[kEmptyFrame] = 1;
   Run(webrtc::test::ResourcePath("audio_coding/teststereo32kHz", "pcm"),
       32000, 2, out_filename, true, expects);
 #endif
 }
 
 }  // namespace webrtc