Restrict OnSuspend() restrictions for audio to non-Android.

media/renderers/audio_renderer_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/renderers/audio_renderer_impl.h"
 
 #include <math.h>
 #include <stddef.h>
 #include <algorithm>
 #include <utility>
@@ skipping 45 matching lines @@
       pending_read_(false),
       received_end_of_stream_(false),
       rendered_end_of_stream_(false),
       is_suspending_(false),
       weak_factory_(this) {
   audio_buffer_stream_->set_splice_observer(base::Bind(
       &AudioRendererImpl::OnNewSpliceBuffer, weak_factory_.GetWeakPtr()));
   audio_buffer_stream_->set_config_change_observer(base::Bind(
       &AudioRendererImpl::OnConfigChange, weak_factory_.GetWeakPtr()));
 
+// Suspend and resume work differently on Android and are handled at a higher
+// level than here. OnSuspend() notifications will be delivered a few seconds
+// after an application is backgrounded, even if it should still be playing.
+// See http://crbug.com/623066 for more details.
+#if !defined(OS_ANDROID)
   // Tests may not have a power monitor.
   base::PowerMonitor* monitor = base::PowerMonitor::Get();
   if (!monitor)
     return;
 
   // PowerObserver's must be added and removed from the same thread, but we
   // won't remove the observer until we're destructed on |task_runner_| so we
   // must post it here if we're on the wrong thread.
   if (task_runner_->BelongsToCurrentThread()) {
     monitor->AddObserver(this);
   } else {
     // Safe to post this without a WeakPtr because this class must be destructed
     // on the same thread and construction has not completed yet.
     task_runner_->PostTask(FROM_HERE,
                            base::Bind(&base::PowerMonitor::AddObserver,
                                       base::Unretained(monitor), this));
   }
+#endif
   // Do not add anything below this line since the above actions are only safe
   // as the last lines of the constructor.
 }
 
 AudioRendererImpl::~AudioRendererImpl() {
   DVLOG(1) << __FUNCTION__;
   DCHECK(task_runner_->BelongsToCurrentThread());
+#if !defined(OS_ANDROID)
   if (base::PowerMonitor::Get())
     base::PowerMonitor::Get()->RemoveObserver(this);
+#endif
 
   // If Render() is in progress, this call will wait for Render() to finish.
   // After this call, the |sink_| will not call back into |this| anymore.
   sink_->Stop();
 
   if (!init_cb_.is_null())
     base::ResetAndReturn(&init_cb_).Run(PIPELINE_ERROR_ABORT);
 }
 
 void AudioRendererImpl::StartTicking() {
@@ skipping 857 matching lines @@
   DCHECK_NE(buffering_state_, buffering_state);
   lock_.AssertAcquired();
   buffering_state_ = buffering_state;
 
   task_runner_->PostTask(
       FROM_HERE, base::Bind(&AudioRendererImpl::OnBufferingStateChange,
                             weak_factory_.GetWeakPtr(), buffering_state_));
 }
 
 }  // namespace media