views: implement width snapping for DialogDelegateViews

ui/views/bubble/info_bubble.h

 // Copyright 2013 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 UI_VIEWS_BUBBLE_INFO_BUBBLE_H_
 #define UI_VIEWS_BUBBLE_INFO_BUBBLE_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
@@ skipping 10 matching lines @@
   ~InfoBubble() override;
 
   // Shows the bubble. |widget_| will be NULL until this is called.
   void Show();
 
   // Hides and closes the bubble.
   void Hide();
 
   // BubbleDialogDelegateView:
   NonClientFrameView* CreateNonClientFrameView(Widget* widget) override;
-  gfx::Size GetPreferredSize() const override;
   void OnWidgetDestroyed(Widget* widget) override;
   void OnWidgetBoundsChanged(Widget* widget,
                              const gfx::Rect& new_bounds) override;
   int GetDialogButtons() const override;
 
+  // DialogDelegateView:
+  gfx::Size GetUnsnappedPreferredSize() const override;

[Peter Kasting, 2017/03/30 00:35:36]

Nit: Leave in above list

+
   View* anchor() { return anchor_; }
   const View* anchor() const { return anchor_; }
 
   void set_preferred_width(int preferred_width) {
     preferred_width_ = preferred_width;
   }
 
  private:
   // Updates the position of the bubble.
   void UpdatePosition();
 
   Widget* widget_;          // Weak, may be NULL.
   View* const anchor_;      // Weak.
   InfoBubbleFrame* frame_;  // Weak, owned by widget.
 
   // The width this bubble prefers to be. Default is 0 (no preference).
   int preferred_width_;
 
   DISALLOW_COPY_AND_ASSIGN(InfoBubble);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BUBBLE_INFO_BUBBLE_H_