[ios] BubbleViewController and BubbleView stubs.

ios/chrome/browser/ui/bubble_promo/bubble_view.h

+// 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_BUBBLE_PROMO_BUBBLE_VIEW_H_
+#define IOS_CHROME_BROWSER_UI_BUBBLE_PROMO_BUBBLE_VIEW_H_
+
+#import <UIKit/UIKit.h>
+
+enum class BubbleArrowDirection;

[edchin, 2017/07/07 04:24:10]

I think these enums need to be declared in this header file
as opposed to the BubbleViewController. The reason
is that this implementation will need it, and 
the VC depends on the view, not the other way around.

[helenlyang, 2017/07/07 23:29:15]

Done.

+enum class BubbleAlignment;
+
+// Speech bubble shaped view that displays a message.
+@interface BubbleView : UIView
+
+@property(nonatomic, readonly) BubbleArrowDirection arrowDirection;

[edchin, 2017/07/07 04:24:10]

I don't think these two lines are going to be needed. You can remove them for
now.

[gchatz, 2017/07/07 04:29:10]

Need comments for properties and designated initializer.

[helenlyang, 2017/07/07 23:29:15]

Done.

+@property(nonatomic, readonly) BubbleAlignment alignment;
+
+- (instancetype)initWithText:(NSString*)text
+                   direction:(BubbleArrowDirection)arrowDirection
+                   alignment:(BubbleAlignment)alignment
+    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_BUBBLE_PROMO_BUBBLE_VIEW_H_