Move ensure keyboard mic check in MediaStreamManager to SetupRequest.

content/browser/renderer_host/media/media_stream_manager.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.
 
 // MediaStreamManager is used to open/enumerate media capture devices (video
 // supported now). Call flow:
 // 1. GenerateStream is called when a render process wants to use a capture
 //    device.
 // 2. MediaStreamManager will ask MediaStreamUIController for permission to
 //    use devices and for which device to use.
@@ skipping 346 matching lines @@
   void AddLogMessageOnUIThread(const std::set<int>& render_process_ids,
                                const std::string& message);
 
   // Handles the callback from MediaStreamUIProxy to receive the UI window id,
   // used for excluding the notification window in desktop capturing.
   void OnMediaStreamUIWindowId(MediaStreamType video_type,
                                StreamDeviceInfoArray devices,
                                gfx::NativeViewId window_id);
 
 #if defined(OS_CHROMEOS)
+  // Ensures that we have checked for presence of a keyboard mic. This is only
+  // done once. This function should be called before posting a request on the
+  // UI thread.
+  void EnsureKeyboardMicChecked();
+
   // Checks if the system has a keyboard mic, and if so, inform the audio
   // manager via SetKeyboardMicOnDeviceThread().
   void CheckKeyboardMicOnUIThread();
 
   // Tells the audio mananger that the system supports a keyboard mic.
   void SetKeyboardMicOnDeviceThread();
 #endif
 
   // Task runner shared by VideoCaptureManager and AudioInputDeviceManager and
   // used for enumerating audio output devices.
@@ skipping 34 matching lines @@
 
   bool use_fake_ui_;
   scoped_ptr<FakeMediaStreamUIProxy> fake_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_MANAGER_H_