Sharpen MdTextButton border for fractional scale factors.

ui/views/painter.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/views/painter.h"
 
 #include <memory>
 
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 47 matching lines @@
 SolidRoundRectPainter::~SolidRoundRectPainter() {}
 
 gfx::Size SolidRoundRectPainter::GetMinimumSize() const {
   return gfx::Size();
 }
 
 void SolidRoundRectPainter::Paint(gfx::Canvas* canvas, const gfx::Size& size) {
   gfx::ScopedCanvas scoped_canvas(canvas);
   const float scale = canvas->UndoDeviceScaleFactor();
 
-  gfx::RectF border_rect_f((gfx::SizeF(size)));
-  border_rect_f.Scale(scale);
+  gfx::RectF border_rect_f(gfx::ScaleToEnclosingRect(gfx::Rect(size), scale));
   const SkScalar scaled_corner_radius = SkFloatToScalar(radius_ * scale);
 
   SkPaint paint;
   paint.setAntiAlias(true);
   paint.setStyle(SkPaint::kFill_Style);
   paint.setColor(bg_color_);
   canvas->DrawRoundRect(border_rect_f, scaled_corner_radius, paint);
 
   border_rect_f.Inset(gfx::InsetsF(0.5f));
   paint.setStyle(SkPaint::kStroke_Style);
@@ skipping 306 matching lines @@
   canvas->DrawImageInt(*images_[LEFT], 0, 0);
   canvas->DrawImageInt(*images_[RIGHT], size.width() - images_[RIGHT]->width(),
                        0);
   canvas->TileImageInt(
       *images_[CENTER], images_[LEFT]->width(), 0,
       size.width() - images_[LEFT]->width() - images_[RIGHT]->width(),
       images_[LEFT]->height());
 }
 
 }  // namespace views