Add gfx::ToRoundedInt safe conversion method from float to int.

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 "ui/gfx/safe_floor_ceil.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);
 }
 
 }  // namespace gfx