Improve painting of cros tray separators.

ui/gfx/canvas.cc

 // 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.
 
 #include "ui/gfx/canvas.h"
 
 #include <cmath>
 #include <limits>
 
 #include "base/i18n/rtl.h"
@@ skipping 316 matching lines @@
   p1.Scale(dsf);
   p2.Scale(dsf);
 
   cc::PaintFlags flags;
   flags.setColor(color);
   flags.setStrokeWidth(SkFloatToScalar(std::floor(dsf)));
 
   DrawLine(p1, p2, flags);
 }
 
+void Canvas::Draw1pxLine(PointF p1, PointF p2, SkColor color) {
+  ScopedCanvas scoped(this);
+  float dsf = UndoDeviceScaleFactor();
+  p1.Scale(dsf);
+  p2.Scale(dsf);
+
+  DrawLine(p1, p2, color);
+}
+
 void Canvas::DrawCircle(const Point& center_point,
                         int radius,
                         const cc::PaintFlags& flags) {
   DrawCircle(PointF(center_point), radius, flags);
 }
 
 void Canvas::DrawCircle(const PointF& center_point,
                         float radius,
                         const cc::PaintFlags& flags) {
   canvas_->drawCircle(SkFloatToScalar(center_point.x()),
@@ skipping 263 matching lines @@
   flags.setFilterQuality(filter ? kLow_SkFilterQuality : kNone_SkFilterQuality);
   flags.setShader(CreateImageRepShaderForScale(
       image_rep, SkShader::kRepeat_TileMode, shader_scale,
       remove_image_scale ? image_rep.scale() : 1.f));
 
   // The rect will be filled by the bitmap.
   canvas_->drawRect(dest_rect, flags);
 }
 
 }  // namespace gfx