Add a Material Design Circular Activity Indicator (Spinner) view for Mac.

chrome/browser/ui/cocoa/spinner_view.h

Index: chrome/browser/ui/cocoa/spinner_view.h
diff --git a/chrome/browser/ui/cocoa/spinner_view.h b/chrome/browser/ui/cocoa/spinner_view.h
new file mode 100644
index 0000000000000000000000000000000000000000..655cbe328e55dc1472e34f6a4e3e818b4fb6376b
--- /dev/null
+++ b/chrome/browser/ui/cocoa/spinner_view.h
@@ -0,0 +1,19 @@
+// Copyright 2015 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.
+
+#ifndef CHROME_BROWSER_UI_COCOA_SPINNER_VIEW_H_
+#define CHROME_BROWSER_UI_COCOA_SPINNER_VIEW_H_
+
+#import <Cocoa/Cocoa.h>
+
+#import "base/mac/scoped_nsobject.h"
+
+@interface SpinnerView : NSView {

[Robert Sesek, 2015/04/02 19:58:35]

This should have a class comment describing what it does (specifically that it's
a Material Design element).

[shrike, 2015/04/02 21:14:57]

Done.

+ @private
+  bool isAnimating_;
+}
+
+@end
+
+#endif  // CHROME_BROWSER_UI_COCOA_SPINNER_VIEW_H_