Implement modal permission prompts for media permissions on Android.

chrome/browser/media/webrtc/media_stream_infobar_delegate_android.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.
 
 #ifndef CHROME_BROWSER_MEDIA_WEBRTC_MEDIA_STREAM_INFOBAR_DELEGATE_ANDROID_H_
 #define CHROME_BROWSER_MEDIA_WEBRTC_MEDIA_STREAM_INFOBAR_DELEGATE_ANDROID_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "chrome/browser/media/webrtc/media_stream_devices_controller.h"
 #include "chrome/browser/permissions/permission_infobar_delegate.h"
 
 // This class configures an infobar shown when a page requests access to a
 // user's microphone and/or video camera.  The user is shown a message asking
 // which audio and/or video devices they wish to use with the current page, and
 // buttons to give access to the selected devices to the page, or to deny access
 // to them.
 class MediaStreamInfoBarDelegateAndroid : public PermissionInfoBarDelegate {
  public:
   // Prompts the user by creating a media stream infobar and delegate,
   // then checks for an existing infobar for |web_contents| and replaces it if
   // found, or just adds the new infobar otherwise.  Returns whether an infobar
   // was created.
   static bool Create(content::WebContents* web_contents,
                      std::unique_ptr<MediaStreamDevicesController> controller);
 
- private:
-  friend class WebRtcTestBase;
-
   MediaStreamInfoBarDelegateAndroid(
       Profile* profile,
       std::unique_ptr<MediaStreamDevicesController> controller);
+ private:
+  friend class WebRtcTestBase;
+
   ~MediaStreamInfoBarDelegateAndroid() override;
 
   // PermissionInfoBarDelegate:
   infobars::InfoBarDelegate::InfoBarIdentifier GetIdentifier() const override;
   Type GetInfoBarType() const override;
   int GetIconId() const override;
   void InfoBarDismissed() override;
   MediaStreamInfoBarDelegateAndroid* AsMediaStreamInfoBarDelegateAndroid()
       override;
   base::string16 GetMessageText() const override;
   base::string16 GetButtonLabel(InfoBarButton button) const override;
   bool Accept() override;
   bool Cancel() override;
   base::string16 GetLinkText() const override;
   GURL GetLinkURL() const override;
   int GetMessageResourceId() const override;
   std::vector<int> content_settings() const override;
 
   std::unique_ptr<MediaStreamDevicesController> controller_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamInfoBarDelegateAndroid);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_WEBRTC_MEDIA_STREAM_INFOBAR_DELEGATE_ANDROID_H_