ui: Remove implicit flooring in skia rect conversion methods.

ui/gfx/rect_conversions.h

 // 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.
 
 #ifndef UI_GFX_RECT_CONVERSIONS_H_
 #define UI_GFX_RECT_CONVERSIONS_H_
 
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_f.h"
 
 namespace gfx {
 
 // Returns the smallest Rect that encloses the given RectF.
 UI_EXPORT Rect ToEnclosingRect(const RectF& rect);
 
 // Returns the largest Rect that is enclosed by the given RectF.
 UI_EXPORT Rect ToEnclosedRect(const RectF& rect);
 
+// Returns the Rect after snapping the corners of the RectF to an integer grid.
+// This should only be used when the RectF you provide is expected to be an
+// integer rect with floating point error. If it is an arbitrary RectF, then
+// you should use a different method.
+UI_EXPORT Rect ToNearestRect(const RectF& rect);
+
 // Returns a Rect obtained by flooring the values of the given RectF.
 // Please prefer the previous two functions in new code.
 UI_EXPORT Rect ToFlooredRectDeprecated(const RectF& rect);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RECT_CONVERSIONS_H_