Draw infobar arrow border with width of 1px on any scale factor.

chrome/browser/ui/views/infobars/infobar_view.h

 // Copyright (c) 2012 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_VIEWS_INFOBARS_INFOBAR_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_INFOBARS_INFOBAR_VIEW_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "components/infobars/core/infobar.h"
@@ skipping 20 matching lines @@
 }  // namespace views
 
 class InfoBarView : public infobars::InfoBar,
                     public views::View,
                     public views::ButtonListener,
                     public views::ExternalFocusTracker,
                     public views::ViewTargeterDelegate {
  public:
   explicit InfoBarView(scoped_ptr<infobars::InfoBarDelegate> delegate);
 
+  const infobars::InfoBarContainer::Delegate* container_delegate() const;
+  // TODO(estade): remove these when MD is default.
   const SkPath& fill_path() const { return fill_path_; }
   const SkPath& stroke_path() const { return stroke_path_; }
 
  protected:
   typedef std::vector<views::Label*> Labels;
 
   static const int kButtonButtonSpacing;
   static const int kEndOfLabelSpacing;
 
   ~InfoBarView() override;
@@ skipping 36 matching lines @@
   // These return x coordinates delimiting the usable area for subclasses to lay
   // out their controls.
   int StartX() const;
   int EndX() const;
 
   // Given a |view|, returns the centered y position within |child_container_|,
   // taking into account animation so the control "slides in" (or out) as we
   // animate open and closed.
   int OffsetY(views::View* view) const;
 
-  // Convenience getter.
-  const infobars::InfoBarContainer::Delegate* container_delegate() const;
-
   // Shows a menu at the specified position.
   // NOTE: This must not be called if we're unowned.  (Subclasses should ignore
   // calls to RunMenu() in this case.)
   void RunMenuAt(ui::MenuModel* menu_model,
                  views::MenuButton* button,
                  views::MenuAnchorPosition anchor);
 
  protected:
   // Adds |view| to the content area, i.e. |child_container_|. The |view| won't
   // automatically get any layout, so should still be laid out manually.
@@ skipping 24 matching lines @@
   // animation.
   views::View* child_container_;
 
   // The optional icon at the left edge of the InfoBar.
   views::ImageView* icon_;
 
   // The close button at the right edge of the InfoBar.
   views::ImageButton* close_button_;
 
   // The paths for the InfoBarBackground to draw, sized according to the heights
   // above.

[Peter Kasting, 2016/03/30 00:20:26]

Nit: Might want removal TODO here also

[Evan Stade, 2016/04/02 02:21:42]

moved the todo here

   SkPath fill_path_;
   SkPath stroke_path_;
 
   // Used to run the menu.
   scoped_ptr<views::MenuRunner> menu_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(InfoBarView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_INFOBARS_INFOBAR_VIEW_H_