Add setting to AppRTCMobile for iOS, that can change capture resolution.

webrtc/examples/BUILD.gn

 # Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../build/webrtc.gni")
 if (is_android) {
@@ skipping 209 matching lines @@
   }
 
   if (is_ios) {
     ios_app_bundle("AppRTCMobile") {
       sources = [
         "objc/AppRTCMobile/ios/ARDAppDelegate.m",
         "objc/AppRTCMobile/ios/ARDMainView.h",
         "objc/AppRTCMobile/ios/ARDMainView.m",
         "objc/AppRTCMobile/ios/ARDMainViewController.h",
         "objc/AppRTCMobile/ios/ARDMainViewController.m",
+        "objc/AppRTCMobile/ios/ARDMediaConstraintsModel.h",
+        "objc/AppRTCMobile/ios/ARDMediaConstraintsModel.m",
+        "objc/AppRTCMobile/ios/ARDMediaConstraintsSettingsStore.h",
+        "objc/AppRTCMobile/ios/ARDMediaConstraintsSettingsStore.m",
+        "objc/AppRTCMobile/ios/ARDSettingsViewController.h",
+        "objc/AppRTCMobile/ios/ARDSettingsViewController.m",
         "objc/AppRTCMobile/ios/ARDStatsView.h",
         "objc/AppRTCMobile/ios/ARDStatsView.m",
         "objc/AppRTCMobile/ios/ARDVideoCallView.h",
         "objc/AppRTCMobile/ios/ARDVideoCallView.m",
         "objc/AppRTCMobile/ios/ARDVideoCallViewController.h",
         "objc/AppRTCMobile/ios/ARDVideoCallViewController.m",
         "objc/AppRTCMobile/ios/AppRTCMobile-Prefix.pch",
         "objc/AppRTCMobile/ios/UIImage+ARDUtilities.h",
         "objc/AppRTCMobile/ios/UIImage+ARDUtilities.m",
         "objc/AppRTCMobile/ios/main.m",
@@ skipping 282 matching lines @@
       "//webrtc/pc:rtc_pc",
       "//webrtc/system_wrappers:field_trial_default",
       "//webrtc/system_wrappers:metrics_default",
     ]
     if (!build_with_chromium && is_clang) {
       # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
   }
 }