[ios] BubbleViewController and BubbleView stubs.

ios/chrome/browser/ui/bubble/bubble_view_controller.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/bubble/bubble_view_controller.h"
+
+#include "base/logging.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@implementation BubbleViewController
+
+- (instancetype)initWithText:(NSString*)text
+                   direction:(BubbleArrowDirection)arrowDirection
+                   alignment:(BubbleAlignment)alignment {
+  self = [super initWithNibName:nil bundle:nil];
+  self.view = [[BubbleView alloc] initWithText:text

[rohitrao (ping after 24h), 2017/07/10 17:44:28]

Should this assignment be in loadView instead?

[edchin, 2017/07/10 17:51:59]

Yes, you're right. We probably would have caught this in the true
implementation. 

Helen, here's more reading on loadView. Notice the difference between loadView
and viewDidLoad. 
https://developer.apple.com/documentation/uikit/uiviewcontroller/1621454-load...

[helenlyang, 2017/07/10 18:21:28]

Fixed. In order to initialize BubbleView in loadView, I stored text,
arrowDirection, and alignment as properties of BubbleVC.

+                                     direction:arrowDirection
+                                     alignment:alignment];
+  return self;
+}
+
+- (void)animateContentIn {
+  NOTIMPLEMENTED();
+}
+
+- (void)dismissAnimated:(BOOL)animated {
+  NOTIMPLEMENTED();
+}
+
+@end