Add a prototype today extension behind gn flag

ios/chrome/proto_today_extension/widget_view_controller.mm

Index: ios/chrome/proto_today_extension/widget_view_controller.mm
diff --git a/ios/chrome/proto_today_extension/widget_view_controller.mm b/ios/chrome/proto_today_extension/widget_view_controller.mm
new file mode 100644
index 0000000000000000000000000000000000000000..4e87e868db931d0fdce7c3bf113aa1ebd5d3f487
--- /dev/null
+++ b/ios/chrome/proto_today_extension/widget_view_controller.mm
@@ -0,0 +1,27 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+#import "ios/chrome/proto_today_extension/widget_view_controller.h"

[Olivier, 2017/01/17 10:13:05]

Add space before

[lody, 2017/01/17 17:31:46]

Done.

+
+#import <NotificationCenter/NotificationCenter.h>
+
+#import "ios/chrome/proto_today_extension/widget_view.h"
+
+@interface WidgetViewController ()
+@property(nonatomic) WidgetView* widgetView;

[Olivier, 2017/01/17 10:13:05]

Is this ARC?

[lody, 2017/01/17 17:31:46]

now it is! ;)

+@end
+
+@implementation WidgetViewController
+
+@synthesize widgetView = _widgetView;
+
+#pragma mark - UIViewController
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  [self setWidgetView:[[WidgetView alloc] init]];

[sdefresne, 2017/01/17 10:39:07]

This leaks unless you're using ARC (which you are not as far as I can tell from
the BUILD.gn file).

BTW, you can use properties syntax here:

  self.widgetView = [[WidgetView alloc] init];
  [self.view addSubview:self.widgetView];

[lody, 2017/01/17 17:31:46]

leak fixed.
regarding using properties syntax, is that better?

+  [self.view addSubview:_widgetView];
+}
+
+@end