This CL adds support for extension in GYP.

test/ios/extension/ExtensionContainer/ViewController.m

Index: test/ios/extension/ExtensionContainer/ViewController.m
diff --git a/test/ios/extension/ExtensionContainer/ViewController.m b/test/ios/extension/ExtensionContainer/ViewController.m
new file mode 100644
index 0000000000000000000000000000000000000000..3810fa9cba82c26b57f07bd011d49218991455d6
--- /dev/null
+++ b/test/ios/extension/ExtensionContainer/ViewController.m
@@ -0,0 +1,24 @@
+// Copyright (c) 2014 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ViewController.h"
+
+@interface ViewController ()
+
+
+@end
+
+@implementation ViewController
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+  // Do any additional setup after loading the view, typically from a nib.
+}
+
+- (void)didReceiveMemoryWarning {
+  [super didReceiveMemoryWarning];
+  // Dispose of any resources that can be recreated.
+}
+
+@end