MacViews: Allow toolkit-views for "Global Error" bubbles.

chrome/browser/ui/cocoa/bubble_anchor_helper_views.h

Index: chrome/browser/ui/cocoa/bubble_anchor_helper_views.h
diff --git a/chrome/browser/ui/cocoa/bubble_anchor_helper_views.h b/chrome/browser/ui/cocoa/bubble_anchor_helper_views.h
new file mode 100644
index 0000000000000000000000000000000000000000..527c5ceb187a1bfff42b85cb3adfd6255293b4a5
--- /dev/null
+++ b/chrome/browser/ui/cocoa/bubble_anchor_helper_views.h
@@ -0,0 +1,16 @@
+// 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 CHROME_BROWSER_UI_COCOA_BUBBLE_ANCHOR_HELPER_VIEWS_H_
+#define CHROME_BROWSER_UI_COCOA_BUBBLE_ANCHOR_HELPER_VIEWS_H_
+
+namespace views {
+class BubbleDialogDelegateView;
+}
+
+// Monitors |bubble|'s parent window for size changes, and updates the bubble
+// anchor. The monitor will be deleted when |bubble| is closed.
+void KeepBubbleAnchored(views::BubbleDialogDelegateView* bubble);
+
+#endif  // CHROME_BROWSER_UI_COCOA_BUBBLE_ANCHOR_HELPER_VIEWS_H_