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

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

+// 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/browser/ui/reading_list/text_badge_view.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface TextBadgeView ()

[gchatz, 2017/06/27 18:20:45]

Do we need the class extension, since there is nothing in it, as of now?

[edchin, 2017/06/28 00:38:23]

Remove this private category for now. 

[edchin, 2017/06/28 00:40:01]

Sorry.. this was already removed, but somehow this comment lingered from a
previous iteration.

+
+@end
+
+@implementation TextBadgeView
+
+- (instancetype)initWithFrame:(CGRect)frame displayText:(NSString*)text {
+  self = [super initWithFrame:frame];
+  return self;
+}
+
+- (void)presentAnimated:(BOOL)animated {
+}
+
+@end