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

webrtc/examples/BUILD.gn

Index: webrtc/examples/BUILD.gn
diff --git a/webrtc/examples/BUILD.gn b/webrtc/examples/BUILD.gn
index e812f9ea9d416cc7702c1c9eecbcf68b615e34c4..b98e17679c23e6f3db25a206653a85e6201a9356 100644
--- a/webrtc/examples/BUILD.gn
+++ b/webrtc/examples/BUILD.gn
@@ -227,6 +227,12 @@ if (is_ios || (is_mac && target_cpu != "x86")) {
         "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",

[magjed_webrtc, 2016/10/31 19:26:39]

Shouldn't ARDMediaConstraintsModelTests.mm be added somewhere? How is the test
executed?

[daniela-webrtc, 2016/11/01 09:51:12]

You are right. At this moment the test is only added but not executed as we
don't have test target for the demo apps. My plan is to wait on
https://codereview.webrtc.org/2050153003/ to land and then add the test to that
target.

         "objc/AppRTCMobile/ios/ARDStatsView.h",
         "objc/AppRTCMobile/ios/ARDStatsView.m",
         "objc/AppRTCMobile/ios/ARDVideoCallView.h",