Change Clock::SetMaxTime() to be safe even in the presence of slow pipelines.

media/base/pipeline.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.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 449 matching lines @@
 }
 
 void Pipeline::OnVideoTimeUpdate(base::TimeDelta max_time) {
   DCHECK(IsRunning());
   base::AutoLock auto_lock(lock_);
 
   if (has_audio_)
     return;
 
   DCHECK(!waiting_for_clock_update_);
-  DCHECK(clock_->Elapsed() <= max_time);
   clock_->SetMaxTime(max_time);
 }
 
 void Pipeline::SetDuration(base::TimeDelta duration) {
   DCHECK(IsRunning());
   media_log_->AddEvent(
       media_log_->CreateTimeEvent(
           MediaLogEvent::DURATION_SET, "duration", duration));
   UMA_HISTOGRAM_LONG_TIMES("Media.Duration", duration);
 
@@ skipping 937 matching lines @@
 void Pipeline::StartClockIfWaitingForTimeUpdate_Locked() {
   lock_.AssertAcquired();
   if (!waiting_for_clock_update_)
     return;
 
   waiting_for_clock_update_ = false;
   clock_->Play();
 }
 
 }  // namespace media