[ios] BubbleViewController and BubbleView stubs.

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

Index: ios/chrome/browser/ui/bubble/bubble_view.h
diff --git a/ios/chrome/browser/ui/bubble/bubble_view.h b/ios/chrome/browser/ui/bubble/bubble_view.h
new file mode 100644
index 0000000000000000000000000000000000000000..7d9ea711982cf5ce459c5dd342dd3122f5efdeae
--- /dev/null
+++ b/ios/chrome/browser/ui/bubble/bubble_view.h
@@ -0,0 +1,43 @@
+// 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_BUBBLE_VIEW_H_
+#define IOS_CHROME_BROWSER_UI_BUBBLE_BUBBLE_VIEW_H_
+
+#import <UIKit/UIKit.h>
+
+// Direction for the bubble to point.
+typedef NS_ENUM(NSInteger, BubbleArrowDirection) {
+  // Bubble is below the target UI element and the arrow is pointing up.
+  BubbleArrowDirectionUp,
+  // Bubble is above the target UI element and the arrow is pointing down.
+  BubbleArrowDirectionDown

[edchin, 2017/07/08 07:58:26]

Our convention is to put a comma after even the last line.
The reason is that it is easy to forget to add a comma
when you decide to add additional lines later. 
You can look up other ENUM examples on code search.

[helenlyang, 2017/07/10 17:15:22]

Done.

+};
+
+// Alignment of the bubble relative to the arrow.
+typedef NS_ENUM(NSInteger, BubbleAlignment) {
+  BubbleAlignmentLeading,
+  BubbleAlignmentCenter,
+  BubbleAlignmentTrailing
+};
+
+// Speech bubble shaped view that displays a message.
+@interface BubbleView : UIView
+
+// Initializes with the given text, direction that the bubble should point, and
+// alignment of the bubble.
+- (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_BUBBLE_VIEW_H_