ui: Remove implicit flooring in skia rect conversion methods.

ui/gfx/rect_conversions.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/rect_conversions.h"
 
+#include <cmath>
+
+#include "base/logging.h"
 #include "ui/gfx/safe_integer_conversions.h"
 
 namespace gfx {
 
 Rect ToEnclosingRect(const RectF& rect) {
   int min_x = ToFlooredInt(rect.origin().x());
   int min_y = ToFlooredInt(rect.origin().y());
   float max_x = rect.origin().x() + rect.size().width();
   float max_y = rect.origin().y() + rect.size().height();
   int width = std::max(ToCeiledInt(max_x) - min_x, 0);
   int height = std::max(ToCeiledInt(max_y) - min_y, 0);
   return Rect(min_x, min_y, width, height);
 }
 
 Rect ToEnclosedRect(const RectF& rect) {
   int min_x = ToCeiledInt(rect.origin().x());
   int min_y = ToCeiledInt(rect.origin().y());
   float max_x = rect.origin().x() + rect.size().width();
   float max_y = rect.origin().y() + rect.size().height();
   int width = std::max(ToFlooredInt(max_x) - min_x, 0);
   int height = std::max(ToFlooredInt(max_y) - min_y, 0);
   return Rect(min_x, min_y, width, height);
 }
 
+Rect ToNearestRect(const RectF& rect) {
+  float float_min_x = rect.origin().x();
+  float float_min_y = rect.origin().y();
+  float float_max_x = float_min_x + rect.size().width();
+  float float_max_y = float_min_y + rect.size().height();
+
+  int min_x = ToRoundedInt(float_min_x);
+  int min_y = ToRoundedInt(float_min_y);
+  int max_x = ToRoundedInt(float_max_x);
+  int max_y = ToRoundedInt(float_max_y);
+
+  // If these DCHECKs fail, you're using the wrong method, consider using
+  // ToEnclosingRect or ToEnclosedRect instead.
+  DCHECK(std::abs(min_x - float_min_x) < 0.01f);
+  DCHECK(std::abs(min_y - float_min_y) < 0.01f);
+  DCHECK(std::abs(max_x - float_max_x) < 0.01f);
+  DCHECK(std::abs(max_y - float_max_y) < 0.01f);
+
+  return Rect(min_x, min_y, max_x - min_x, max_y - min_y);
+}
+
 Rect ToFlooredRectDeprecated(const RectF& rect) {
   return Rect(ToFlooredInt(rect.origin().x()),
               ToFlooredInt(rect.origin().y()),
               ToFlooredInt(rect.size().width()),
               ToFlooredInt(rect.size().height()));
 }
 
 }  // namespace gfx