[Video] Fix keyframe distance average calculations.

media/base/pipeline_impl.cc

 // 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.
 
 #include "media/base/pipeline_impl.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 629 matching lines @@
   DVLOG(3) << __func__;
   DCHECK(media_task_runner_->BelongsToCurrentThread());
 
   base::AutoLock auto_lock(shared_state_lock_);
   shared_state_.statistics.audio_bytes_decoded += stats.audio_bytes_decoded;
   shared_state_.statistics.video_bytes_decoded += stats.video_bytes_decoded;
   shared_state_.statistics.video_frames_decoded += stats.video_frames_decoded;
   shared_state_.statistics.video_frames_dropped += stats.video_frames_dropped;
   shared_state_.statistics.audio_memory_usage += stats.audio_memory_usage;
   shared_state_.statistics.video_memory_usage += stats.video_memory_usage;
-  shared_state_.statistics.video_keyframe_distance_average =
-      stats.video_keyframe_distance_average;
+
+  if (stats.video_keyframe_distance_average != kNoTimestamp) {
+    shared_state_.statistics.video_keyframe_distance_average =
+        stats.video_keyframe_distance_average;
+  }
 }
 
 void PipelineImpl::RendererWrapper::OnBufferingStateChange(
     BufferingState state) {
   DCHECK(media_task_runner_->BelongsToCurrentThread());
   DVLOG(2) << __func__ << "(" << state << ") ";
 
   main_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&PipelineImpl::OnBufferingStateChange, weak_pipeline_, state));
@@ skipping 673 matching lines @@
 void PipelineImpl::OnSuspendDone() {
   DVLOG(3) << __func__;
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(IsRunning());
 
   DCHECK(!suspend_cb_.is_null());
   base::ResetAndReturn(&suspend_cb_).Run(PIPELINE_OK);
 }
 
 }  // namespace media