Don't start speech synthesis until after the audio mixer is initialized.

chrome/browser/chromeos/audio_mixer_alsa.cc

 // Copyright (c) 2011 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 "chrome/browser/chromeos/audio_mixer_alsa.h"
 
 #include <unistd.h>
 
 #include <algorithm>
 #include <cmath>
 
 #include <alsa/asoundlib.h>
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/task.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/extensions/extension_tts_api_chromeos.h"
 #include "chrome/browser/prefs/pref_service.h"
+#include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_types.h"
 
 typedef long alsa_long_t;  // 'long' is required for ALSA API calls.
 
 using content::BrowserThread;
 using std::max;
 using std::min;
 using std::string;
 
 namespace chromeos {
 
@@ skipping 262 matching lines @@
   {
     base::AutoLock lock(lock_);
     alsa_mixer_ = handle;
     master_element_ = master_element;
     pcm_element_ = pcm_element;
     min_volume_db_ = min_volume_db;
     max_volume_db_ = max_volume_db;
     volume_db_ = min(max(volume_db_, min_volume_db_), max_volume_db_);
   }
 
+  // The speech synthesis service shouldn't be initialized until after
+  // we get to this point, so we call this function to tell it that it's
+  // safe to do TTS now.  NotificationService would be cleaner,
+  // but it's not available at this point.
+  EnableChromeOsTts();
+
   ApplyState();
   return true;
 }
 
 void AudioMixerAlsa::Disconnect() {
   DCHECK(MessageLoop::current() == thread_->message_loop());
   if (alsa_mixer_) {
     snd_mixer_close(alsa_mixer_);
     alsa_mixer_ = NULL;
   }
@@ skipping 125 matching lines @@
   if (alsa_result != 0) {
     LOG(WARNING) << "snd_mixer_selem_set_playback_switch_all() failed: "
                  << snd_strerror(alsa_result);
   } else {
     VLOG(1) << "Set playback switch " << snd_mixer_selem_get_name(element)
             << " to " << mute;
   }
 }
 
 }  // namespace chromeos