Added initial muted state to stream creation callback, to avoid races.

media/audio/audio_input_controller.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/audio/audio_input_controller.h"
 
 #include <inttypes.h>
 
 #include <algorithm>
 #include <limits>
@@ skipping 341 matching lines @@
   // lower level. AGC can fail on platforms where we don't support the
   // functionality to modify the input volume slider. One such example is
   // Windows XP.
   power_measurement_is_enabled_ &= agc_is_supported;
 #else
   stream_to_control->SetAutomaticGainControl(enable_agc);
 #endif
 
   // Finally, keep the stream pointer around, update the state and notify.
   stream_ = stream_to_control;
-  handler_->OnCreated(this);
 
-  // Check the current muted state and start the repeating timer to keep that
-  // updated.
-  CheckMutedState();
+  // Send initial muted state along with OnCreated, to avoid races.
+  is_muted_ = stream_->IsMuted();
+  handler_->OnCreated(this, is_muted_);
+
   check_muted_state_timer_.Start(
       FROM_HERE, base::TimeDelta::FromSeconds(kCheckMutedStateIntervalSeconds),
       this, &AudioInputController::CheckMutedState);
   DCHECK(check_muted_state_timer_.IsRunning());
 }
 
 void AudioInputController::DoRecord() {
   DCHECK(task_runner_->BelongsToCurrentThread());
   SCOPED_UMA_HISTOGRAM_TIMER("Media.AudioInputController.RecordTime");
 
@@ skipping 321 matching lines @@
     case AudioParameters::Format::AUDIO_PCM_LOW_LATENCY:
       return AudioInputController::StreamType::LOW_LATENCY;
     default:
       // Currently, the remaining supported type is fake. Reconsider if other
       // formats become supported.
       return AudioInputController::StreamType::FAKE;
   }
 }
 
 }  // namespace media