This CL adds support for extension in GYP.

test/ios/extension/ActionExtension/ActionViewController.m

+// 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 ()
+
+

[pkl (ping after 24h if needed), 2014/07/09 08:07:50]

Just 1 blank line. And is it really necessary to have this empty declaration?

[olivierrobin, 2014/07/09 12:46:27]

Done.

+@end
+
+@implementation ActionViewController
+
+- (instancetype)initWithNibName:(NSString *)nibNameOrNil

[pkl (ping after 24h if needed), 2014/07/09 08:07:50]

No space before *. Here and below.

[olivierrobin, 2014/07/09 12:46:27]

Done.

+                         bundle:(NSBundle *)nibBundleOrNil {
+    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
+    if (self) {
+        // Custom initialization
+    }
+    return self;

[pkl (ping after 24h if needed), 2014/07/09 08:07:50]

Can't you just get rid of this boilerplate initializer? And the -viewDidLoad and
-didReceiveMemoryWarning method below?

[olivierrobin, 2014/07/09 12:46:27]

Done.

+}
+
+- (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.

[pkl (ping after 24h if needed), 2014/07/09 08:07:50]

indent 2.

[olivierrobin, 2014/07/09 12:46:27]

Done.

+    // This template doesn't do anything, so we just echo the passed in items.
+    [self.extensionContext
+        completeRequestReturningItems:self.extensionContext.inputItems
+        completionHandler:nil];
+}
+
+@end