Adding key press detection in the browser process.

content/browser/renderer_host/media/audio_input_renderer_host.h

 // 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.
 //
 // AudioInputRendererHost serves audio related requests from audio capturer
 // which lives inside the render process and provide access to audio hardware.
 //
 // Create stream sequence (AudioInputController = AIC):
 //
 // AudioInputHostMsg_CreateStream -> OnCreateStream -> AIC::CreateLowLatency ->
@@ skipping 26 matching lines @@
 #include "content/common/media/audio_messages.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "content/public/browser/browser_thread.h"
 #include "media/audio/audio_input_controller.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/simple_sources.h"
 
 namespace media {
 class AudioManager;
 class AudioParameters;
+class UserInputMonitor;
 }
 
 namespace content {
 class AudioMirroringManager;
 class MediaStreamManager;
 
 class CONTENT_EXPORT AudioInputRendererHost
     : public BrowserMessageFilter,
       public media::AudioInputController::EventHandler {
  public:
   // Called from UI thread from the owner of this object.
-  AudioInputRendererHost(
-      media::AudioManager* audio_manager,
-      MediaStreamManager* media_stream_manager,
-      AudioMirroringManager* audio_mirroring_manager);
+  // |user_input_monitor| is used for typing detection and can be NULL.
+  AudioInputRendererHost(media::AudioManager* audio_manager,
+                         MediaStreamManager* media_stream_manager,
+                         AudioMirroringManager* audio_mirroring_manager,
+                         media::UserInputMonitor* user_input_monitor);
 
   // BrowserMessageFilter implementation.
   virtual void OnChannelClosing() OVERRIDE;
   virtual void OnDestruct() const OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok) OVERRIDE;
 
   // AudioInputController::EventHandler implementation.
   virtual void OnCreated(media::AudioInputController* controller) OVERRIDE;
   virtual void OnRecording(media::AudioInputController* controller) OVERRIDE;
@@ skipping 75 matching lines @@
   media::AudioManager* audio_manager_;
 
   // Used to access to AudioInputDeviceManager.
   MediaStreamManager* media_stream_manager_;
 
   AudioMirroringManager* audio_mirroring_manager_;
 
   // A map of stream IDs to audio sources.
   AudioEntryMap audio_entries_;
 
+  // Raw pointer of the UserInputMonitor.
+  media::UserInputMonitor* user_input_monitor_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioInputRendererHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_RENDERER_HOST_H_