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

webrtc/examples/objc/AppRTCMobile/ios/ARDMediaConstraintsModel+Private.h

Index: webrtc/examples/objc/AppRTCMobile/ios/ARDMediaConstraintsModel+Private.h
diff --git a/webrtc/base/logging_mac.mm b/webrtc/examples/objc/AppRTCMobile/ios/ARDMediaConstraintsModel+Private.h
similarity index 56%
copy from webrtc/base/logging_mac.mm
copy to webrtc/examples/objc/AppRTCMobile/ios/ARDMediaConstraintsModel+Private.h
index ffee3541a48245e0179670ce2b013f957bc6b88a..57d507b8142f0595ee217e3f3a363cfdcefbce35 100644
--- a/webrtc/base/logging_mac.mm
+++ b/webrtc/examples/objc/AppRTCMobile/ios/ARDMediaConstraintsModel+Private.h
@@ -8,15 +8,15 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "webrtc/base/logging.h"
-
 #import <Foundation/Foundation.h>
+#import "ARDMediaConstraintsModel.h"
 
+@class ARDMediaConstraintsSettingsStore;
 
-namespace rtc {
-std::string DescriptionFromOSStatus(OSStatus err) {
-  NSError* error =
-      [NSError errorWithDomain:NSOSStatusErrorDomain code:err userInfo:nil];
-  return error.description.UTF8String;
-}
-}  // namespace rtc
+NS_ASSUME_NONNULL_BEGIN
+@interface ARDMediaConstraintsModel ()
+- (ARDMediaConstraintsSettingsStore *)settingsStore;
+- (nullable NSString *)currentVideoResolutionWidthFromStore;
+- (nullable NSString *)currentVideoResolutionHeightFromStore;
+@end
+NS_ASSUME_NONNULL_END