Move talk/examples/* to webrtc/examples.

webrtc/examples/objc/AppRTCDemo/RTCMediaConstraints+JSON.m

+/*
+ *  Copyright 2014 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 "RTCMediaConstraints+JSON.h"
+
+#import "RTCPair.h"
+
+static NSString const *kRTCMediaConstraintsMandatoryKey = @"mandatory";
+
+@implementation RTCMediaConstraints (JSON)
+
++ (RTCMediaConstraints *)constraintsFromJSONDictionary:
+    (NSDictionary *)dictionary {
+  NSDictionary *mandatory = dictionary[kRTCMediaConstraintsMandatoryKey];
+  NSMutableArray *mandatoryContraints =
+      [NSMutableArray arrayWithCapacity:[mandatory count]];
+  [mandatory enumerateKeysAndObjectsUsingBlock:^(
+      id key, id obj, BOOL *stop) {
+    [mandatoryContraints addObject:[[RTCPair alloc] initWithKey:key
+                                                          value:obj]];
+  }];
+  // TODO(tkchin): figure out json formats for optional constraints.
+  RTCMediaConstraints *constraints =
+      [[RTCMediaConstraints alloc]
+          initWithMandatoryConstraints:mandatoryContraints
+                   optionalConstraints:nil];
+  return constraints;
+}
+
+@end