Switch Speech Recognition to asynchronous callback-based AudioManager interactions.

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index a30bab3f8b97aaa0964962e89be0c9e87de39896..a1c26ae93df59d6e9de02a4e89ef1a5fc326b82e 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -92,6 +92,7 @@
 #include "content/public/common/result_codes.h"
 #include "device/battery/battery_status_service.h"
 #include "device/gamepad/gamepad_service.h"
+#include "media/audio/audio_system_impl.h"
 #include "media/base/media.h"
 #include "media/base/user_input_monitor.h"
 #include "media/midi/midi_service.h"
@@ -1538,8 +1539,8 @@ int BrowserMainLoop::BrowserThreadsStarted() {
   {
     TRACE_EVENT0("startup",
       "BrowserMainLoop::BrowserThreadsStarted:InitSpeechRecognition");
-    speech_recognition_manager_.reset(
-        new SpeechRecognitionManagerImpl(media_stream_manager_.get()));
+    speech_recognition_manager_.reset(new SpeechRecognitionManagerImpl(
+        audio_system_.get(), media_stream_manager_.get()));
   }
 
   {
@@ -1798,6 +1799,9 @@ void BrowserMainLoop::CreateAudioManager() {
         MediaInternals::GetInstance());
   }
   CHECK(audio_manager_);
+
+  audio_system_ = media::AudioSystemImpl::Create(audio_manager_.get());
+  CHECK(audio_system_);
 }
 
 }  // namespace content