Reland of Split iOS sdk in to separate targets

webrtc/sdk/objc/Framework/Classes/Common/NSString+StdString.h

Index: webrtc/sdk/objc/Framework/Classes/Common/NSString+StdString.h
diff --git a/webrtc/sdk/objc/Framework/Classes/Common/NSString+StdString.h b/webrtc/sdk/objc/Framework/Classes/Common/NSString+StdString.h
new file mode 100644
index 0000000000000000000000000000000000000000..8bf6cc94be0346e398ab1a980af6378f06ccb7a5
--- /dev/null
+++ b/webrtc/sdk/objc/Framework/Classes/Common/NSString+StdString.h
@@ -0,0 +1,26 @@
+/*
+ *  Copyright 2015 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 <Foundation/Foundation.h>
+
+#include <string>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface NSString (StdString)
+
+@property(nonatomic, readonly) std::string stdString;
+
++ (std::string)stdStringForString:(NSString *)nsString;
++ (NSString *)stringForStdString:(const std::string&)stdString;
+
+@end
+
+NS_ASSUME_NONNULL_END