Move all the examples from the talk directory into the webrtc examples directory.

Significant changes:

- move the libjingle_examples.gyp file into webrtc directory.
- rename talk/examples/android to webrtc/examples/androidapp to avoid name conflicts.
- update paths in talk/libjingle_tests.gyp to point to webrtc directory for Objective-C test.

BUG=
R=pthatcher@webrtc.org, tkchin@webrtc.org

Review URL: https://codereview.webrtc.org/1235563006 .

Cr-Commit-Position: refs/heads/master@{#9681}

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

@@ -0,0 +1,33 @@
+/*
+ *  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 "RTCSessionDescription+JSON.h"
+
+static NSString const *kRTCSessionDescriptionTypeKey = @"type";
+static NSString const *kRTCSessionDescriptionSdpKey = @"sdp";
+
+@implementation RTCSessionDescription (JSON)
+
++ (RTCSessionDescription *)descriptionFromJSONDictionary:
+    (NSDictionary *)dictionary {
+  NSString *type = dictionary[kRTCSessionDescriptionTypeKey];
+  NSString *sdp = dictionary[kRTCSessionDescriptionSdpKey];
+  return [[RTCSessionDescription alloc] initWithType:type sdp:sdp];
+}
+
+- (NSData *)JSONData {
+  NSDictionary *json = @{
+    kRTCSessionDescriptionTypeKey : self.type,
+    kRTCSessionDescriptionSdpKey : self.description
+  };
+  return [NSJSONSerialization dataWithJSONObject:json options:0 error:nil];
+}
+
+@end