Site Settings Desktop: Implement media picker for camera/mic categories.

chrome/browser/ui/webui/settings/settings_media_devices_selection_handler.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2016 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.
 
-#ifndef CHROME_BROWSER_UI_WEBUI_OPTIONS_MEDIA_DEVICES_SELECTION_HANDLER_H_
-#define CHROME_BROWSER_UI_WEBUI_OPTIONS_MEDIA_DEVICES_SELECTION_HANDLER_H_
+#ifndef CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_MEDIA_DEVICES_SELECTION_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_MEDIA_DEVICES_SELECTION_HANDLER_H_
 
 #include "base/macros.h"
+#include "base/scoped_observer.h"
 #include "chrome/browser/media/media_capture_devices_dispatcher.h"
-#include "chrome/browser/ui/webui/options/options_ui.h"
+#include "chrome/browser/ui/webui/settings/settings_page_ui_handler.h"
 #include "content/public/browser/web_contents.h"
 
-namespace options {
+namespace settings {
 
 // Handler for media devices selection in content settings.
 class MediaDevicesSelectionHandler
     : public MediaCaptureDevicesDispatcher::Observer,
-      public OptionsPageUIHandler {
+      public SettingsPageUIHandler {
  public:
-  MediaDevicesSelectionHandler();
+  explicit MediaDevicesSelectionHandler(Profile* profile);
   ~MediaDevicesSelectionHandler() override;
 
-  // OptionsPageUIHandler implementation.
-  void GetLocalizedValues(base::DictionaryValue* values) override;
-  void InitializePage() override;
+  // SettingsPageUIHandler:
+  void OnJavascriptAllowed() override;
+  void OnJavascriptDisallowed() override;
   void RegisterMessages() override;
 
-  // MediaCaptureDevicesDispatcher::Observer implementation.
+  // MediaCaptureDevicesDispatcher::Observer:
   void OnUpdateAudioDevices(
       const content::MediaStreamDevices& devices) override;
   void OnUpdateVideoDevices(
       const content::MediaStreamDevices& devices) override;
 
  private:
   enum DeviceType {
     AUDIO,
     VIDEO,
   };
 
+  // Fetches the list of default capture devices.
+  void GetDefaultCaptureDevices(const base::ListValue* args);
+
   // Sets the default audio/video capture device for media. |args| includes the
   // media type (kAuudio/kVideo) and the unique id of the new default device
   // that the user has chosen.
   void SetDefaultCaptureDevice(const base::ListValue* args);
 
   // Helpers methods to update the device menus.
   void UpdateDevicesMenuForType(DeviceType type);
   void UpdateDevicesMenu(DeviceType type,
                          const content::MediaStreamDevices& devices);
 
+  Profile* profile_;  // Weak pointer.
+
+  ScopedObserver<MediaCaptureDevicesDispatcher,
+                 MediaCaptureDevicesDispatcher::Observer> observer_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaDevicesSelectionHandler);
 };
 
-}  // namespace options
+}  // namespace settings
 
-#endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_MEDIA_DEVICES_SELECTION_HANDLER_H_
+#endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_MEDIA_DEVICES_SELECTION_HANDLER_H_