Fix appearance of header row separators in table view at fractional

ui/gfx/canvas.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 UI_GFX_CANVAS_H_
 #define UI_GFX_CANVAS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 274 matching lines @@
   // Draws a line with the given |flags| parameters.
   // DEPRECATED in favor of the RectF version below.
   // TODO(funkysidd): Remove this (http://crbug.com/553726)
   void DrawLine(const Point& p1, const Point& p2, const cc::PaintFlags& flags);
 
   // Draws a line with the given |flags| parameters.
   void DrawLine(const PointF& p1,
                 const PointF& p2,
                 const cc::PaintFlags& flags);
 
+  // Draws a line that's a single DIP. At fractional scale factors, this is
+  // floored to the nearest integral number of pixels.
+  void DrawSharpLine(PointF p1, PointF p2, SkColor color);
+
   // Draws a circle with the given |flags| parameters.
   // DEPRECATED in favor of the RectF version below.
   // TODO(funkysidd): Remove this (http://crbug.com/553726)
   void DrawCircle(const Point& center_point,
                   int radius,
                   const cc::PaintFlags& flags);
 
   // Draws a circle with the given |flags| parameters.
   void DrawCircle(const PointF& center_point,
                   float radius,
@@ skipping 110 matching lines @@
   // Draws a dotted gray rectangle used for focus purposes.
   // DEPRECATED in favor of the RectF version below.
   // TODO(funkysidd): Remove this (http://crbug.com/553726)
   void DrawFocusRect(const Rect& rect);
 
   // Draws a dotted gray rectangle used for focus purposes.
   void DrawFocusRect(const RectF& rect);
 
   // Draws a |rect| in the specified region with the specified |color| with a
   // with of one logical pixel which might be more device pixels.
-  void DrawSolidFocusRect(const RectF& rect, SkColor color, float thickness);
+  void DrawSolidFocusRect(RectF rect, SkColor color, float thickness);
 
   // Tiles the image in the specified region.
   // Parameters are specified relative to current canvas scale not in pixels.
   // Thus, |x| is 2 pixels if canvas scale = 2 & |x| = 1.
   void TileImageInt(const ImageSkia& image,
                     int x,
                     int y,
                     int w,
                     int h);
   void TileImageInt(const ImageSkia& image,
@@ skipping 72 matching lines @@
   // but surface_ will be null.
   sk_sp<cc::PaintSurface> surface_;
   cc::PaintCanvas* canvas_;
 
   DISALLOW_COPY_AND_ASSIGN(Canvas);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_CANVAS_H_