Fixing focus highlight on high DPI devices for accessibility

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 314 matching lines @@
 }
 
 void Canvas::DrawPath(const SkPath& path, const SkPaint& paint) {
   canvas_->drawPath(path, paint);
 }
 
 void Canvas::DrawFocusRect(const Rect& rect) {
   DrawDashedRect(rect, SK_ColorGRAY);
 }
 
+void Canvas::DrawSolidFocusRect(const Rect& rect, SkColor color) {
+  SkPaint paint;
+  paint.setColor(color);
+  paint.setStrokeWidth(SkIntToScalar(1));
+  // Note: We cannot use DrawRect since it would create a path and fill it which
+  // would cause problems near the edge of the canvas.
+  int x1 = std::min(rect.x(), rect.right());
+  int x2 = std::max(rect.x(), rect.right());
+  int y1 = std::min(rect.y(), rect.bottom());
+  int y2 = std::max(rect.y(), rect.bottom());
+  DrawLine(Point(x1, y1), Point(x2, y1), paint);
+  DrawLine(Point(x1, y2), Point(x2, y2), paint);
+  DrawLine(Point(x1, y1), Point(x1, y2), paint);
+  DrawLine(Point(x2, y1), Point(x2, y2 + 1), paint);
+}
+
 void Canvas::DrawImageInt(const ImageSkia& image, int x, int y) {
   SkPaint paint;
   DrawImageInt(image, x, y, paint);
 }
 
 void Canvas::DrawImageInt(const ImageSkia& image, int x, int y, uint8 a) {
   SkPaint paint;
   paint.setAlpha(a);
   DrawImageInt(image, x, y, paint);
 }
@@ skipping 289 matching lines @@
 
     float bitmap_scale = image_rep.scale();
     if (scale_x < bitmap_scale || scale_y < bitmap_scale)
       const_cast<SkBitmap&>(image_rep.sk_bitmap()).buildMipMap();
   }
 
   return image_rep;
 }
 
 }  // namespace gfx