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

chrome/browser/chromeos/audio_mixer_alsa.cc

Index: chrome/browser/chromeos/audio_mixer_alsa.cc
===================================================================
--- chrome/browser/chromeos/audio_mixer_alsa.cc	(revision 109026)
+++ chrome/browser/chromeos/audio_mixer_alsa.cc	(working copy)
@@ -17,6 +17,7 @@
 #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/pref_names.h"
 #include "content/public/browser/browser_thread.h"
@@ -302,6 +303,12 @@
     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;
 }