[ios] TextBadgeView interface, implementation, and unit test stubs

ios/chrome/browser/ui/reading_list/text_badge_view.h

Index: ios/chrome/browser/ui/reading_list/text_badge_view.h
diff --git a/ios/chrome/browser/ui/reading_list/text_badge_view.h b/ios/chrome/browser/ui/reading_list/text_badge_view.h
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index 0000000000000000000000000000000000000000..6605b965513a0ead492e844947aa5c0976de85ca
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+++ b/ios/chrome/browser/ui/reading_list/text_badge_view.h
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+// 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.
+
+#ifndef IOS_CHROME_BROWSER_UI_READING_LIST_TEXT_BADGE_VIEW_H_
+#define IOS_CHROME_BROWSER_UI_READING_LIST_TEXT_BADGE_VIEW_H_
+
+#import <UIKit/UIKit.h>
+
+// Pill-shaped view that displays white text.
+@interface TextBadgeView : UIView
+
+// Initialize the text badge with the given display text.
+- (instancetype)initWithText:(NSString*)text NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)initWithFrame:(CGRect)frame NS_UNAVAILABLE;
+
+- (instancetype)initWithCoder:(NSCoder*)aDecoder NS_UNAVAILABLE;
+
+- (instancetype)init NS_UNAVAILABLE;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_READING_LIST_TEXT_BADGE_VIEW_H_