[Video] Fix keyframe distance average calculations.

media/base/pipeline_status.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BASE_PIPELINE_STATUS_H_
 #define MEDIA_BASE_PIPELINE_STATUS_H_
 
 #include <stdint.h>
 #include <string>
 
 #include "base/callback.h"
 #include "base/time/time.h"
+#include "media/base/timestamp_constants.h"
 
 namespace media {
 
 // Status states for pipeline.  All codes except PIPELINE_OK indicate errors.
 // Logged to UMA, so never reuse a value, always add new/greater ones!
 enum PipelineStatus {
   PIPELINE_OK = 0,
   // Deprecated: PIPELINE_ERROR_URL_NOT_FOUND = 1,
   PIPELINE_ERROR_NETWORK = 2,
   PIPELINE_ERROR_DECODE = 3,
@@ skipping 29 matching lines @@
 
 typedef base::Callback<void(PipelineStatus)> PipelineStatusCB;
 
 struct PipelineStatistics {
   uint64_t audio_bytes_decoded = 0;
   uint64_t video_bytes_decoded = 0;
   uint32_t video_frames_decoded = 0;
   uint32_t video_frames_dropped = 0;
   int64_t audio_memory_usage = 0;
   int64_t video_memory_usage = 0;
-  base::TimeDelta video_keyframe_distance_average;
+  base::TimeDelta video_keyframe_distance_average = kNoTimestamp;
 };
 
 // Used for updating pipeline statistics; the passed value should be a delta
 // of all attributes since the last update.
 typedef base::Callback<void(const PipelineStatistics&)> StatisticsCB;
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_STATUS_H_