Improve painting of cros tray separators.

ui/gfx/canvas.h

Index: ui/gfx/canvas.h
diff --git a/ui/gfx/canvas.h b/ui/gfx/canvas.h
index 4431261bb061bd108ce836d9c0d091df59f19f04..9c339a5ca6564ea083ef1debd3cacf51cf0c039a 100644
--- a/ui/gfx/canvas.h
+++ b/ui/gfx/canvas.h
@@ -279,7 +279,7 @@ class GFX_EXPORT Canvas {
   // TODO(funkysidd): Remove this (http://crbug.com/553726)
   void DrawLine(const Point& p1, const Point& p2, SkColor color);
 
-  // Draws a single pixel line with the specified color.
+  // Draws a single dip line with the specified color.
   void DrawLine(const PointF& p1, const PointF& p2, SkColor color);
 
   // Draws a line with the given |flags| parameters.
@@ -296,6 +296,9 @@ class GFX_EXPORT Canvas {
   // floored to the nearest integral number of pixels.
   void DrawSharpLine(PointF p1, PointF p2, SkColor color);
 
+  // As above, but draws a single pixel at all scale factors.
+  void Draw1pxLine(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)