Adding key press detection in the browser process.

content/browser/speech/speech_recognizer_impl.cc

 // Copyright (c) 2013 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 "content/browser/speech/speech_recognizer_impl.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/time/time.h"
 #include "content/browser/browser_main_loop.h"
@@ skipping 546 matching lines @@
                            in_params.bits_per_sample(),
                            frames_per_buffer);
   }
 
   // Create an audio converter which converts data between native input format
   // and WebSpeech specific output format.
   audio_converter_.reset(
       new OnDataConverter(input_parameters, output_parameters));
 
   audio_controller_ = AudioInputController::Create(
-      audio_manager, this, input_parameters, device_id_);
+      audio_manager, this, input_parameters, device_id_, NULL);
 
   if (!audio_controller_.get()) {
     return Abort(SpeechRecognitionError(SPEECH_RECOGNITION_ERROR_AUDIO));
   }
 
   // The endpointer needs to estimate the environment/background noise before
   // starting to treat the audio as user input. We wait in the state
   // ESTIMATING_ENVIRONMENT until such interval has elapsed before switching
   // to user input mode.
   endpointer_.SetEnvironmentEstimationMode();
@@ skipping 232 matching lines @@
 SpeechRecognizerImpl::FSMEventArgs::FSMEventArgs(FSMEvent event_value)
     : event(event_value),
       audio_data(NULL),
       engine_error(SPEECH_RECOGNITION_ERROR_NONE) {
 }
 
 SpeechRecognizerImpl::FSMEventArgs::~FSMEventArgs() {
 }
 
 }  // namespace content