Upstream code and resources for Chrome on iOS extensions.

ios/chrome/today_extension/transparent_button.h

+// 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 IOS_CHROME_TODAY_EXTENSION_TRANSPARENT_BUTTON_H_
+#define IOS_CHROME_TODAY_EXTENSION_TRANSPARENT_BUTTON_H_
+
+#import <UIKit/UIKit.h>
+
+// A button that has a transparent background with Vibrancy effect and an ink
+// ripple effect.
+@interface TransparentButton : UIButton
+
+- (instancetype)initWithFrame:(CGRect)frame;
+
+// A container view to add subviews to the button.
+@property(nonatomic, readonly) UIView* contentView;
+
+// The color of the border of the button.
+@property(nonatomic, retain) UIColor* borderColor;
+
+// The width of the border of the button.
+@property(nonatomic) CGFloat borderWidth;
+
+// The ink color.
+@property(nonatomic, retain) UIColor* inkColor;
+
+// The corner radius of the button.
+@property(nonatomic, assign) CGFloat cornerRadius;
+
+@end
+
+#endif  // IOS_CHROME_TODAY_EXTENSION_TRANSPARENT_BUTTON_H_