Add implementation and tests for RTCIceServer

webrtc/base/objc/NSString+StdString.mm

Index: webrtc/base/objc/NSString+StdString.mm
diff --git a/webrtc/base/objc/NSString+StdString.mm b/webrtc/base/objc/NSString+StdString.mm
new file mode 100644
index 0000000000000000000000000000000000000000..95cbe7aacf00909b5d6f8b72b7fd08c2985cb9f1
--- /dev/null
+++ b/webrtc/base/objc/NSString+StdString.mm
@@ -0,0 +1,25 @@
+/*
+ *  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 "NSString+StdString.h"
+
+@implementation NSString (StdString)
+
+- (std::string)stdString {
+  return [NSString stdStringForString:self];
+}
+
++ (std::string)stdStringForString:(NSString *)nsString {
+  NSData *charData = [nsString dataUsingEncoding:NSUTF8StringEncoding];
+  return std::string(reinterpret_cast<const char *>(charData.bytes),
+                     charData.length);
+}
+
+@end