This CL adds support for extension in GYP.

test/ios/extension/ActionExtension/ActionViewController.m

Index: test/ios/extension/ActionExtension/ActionViewController.m
diff --git a/test/ios/extension/ActionExtension/ActionViewController.m b/test/ios/extension/ActionExtension/ActionViewController.m
new file mode 100644
index 0000000000000000000000000000000000000000..801dfde030620a155e9b401f0a459d0f4b36b79d
--- /dev/null
+++ b/test/ios/extension/ActionExtension/ActionViewController.m
@@ -0,0 +1,41 @@
+// 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 "ActionViewController.h"
+#import <MobileCoreServices/MobileCoreServices.h>
+
+@interface ActionViewController ()
+
+
+@end
+
+@implementation ActionViewController
+
+- (instancetype)initWithNibName:(NSString *)nibNameOrNil
+                         bundle:(NSBundle *)nibBundleOrNil {
+    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
+    if (self) {
+        // Custom initialization
+    }
+    return self;
+}
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+}
+
+- (void)didReceiveMemoryWarning {
+    [super didReceiveMemoryWarning];
+    // Dispose of any resources that can be recreated.
+}
+
+- (IBAction)done {
+    // Return any edited content to the host app.
+    // This template doesn't do anything, so we just echo the passed in items.
+    [self.extensionContext
+        completeRequestReturningItems:self.extensionContext.inputItems
+        completionHandler:nil];
+}
+
+@end