Do not convert from RectF to Rect by flooring.

ui/gfx/safe_floor_ceil.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 <cmath>
+#include <limits>
+
+namespace gfx {
+
+int ClampToInt(float value) {

[sky, 2012/09/27 20:33:55]

Do we really need all this? Are we really passing around max/nan?

+  if (value != value)
+     return 0; // no int NaN.
+  if (value > std::numeric_limits<int>::max())
+    return std::numeric_limits<int>::max();
+  if (value < std::numeric_limits<int>::min())
+    return std::numeric_limits<int>::max();
+  return static_cast<int>(value);
+}
+
+int ToFlooredInt(float value) {
+  return ClampToInt(std::floor(value));
+}
+
+int ToCeiledInt(float value) {
+  return ClampToInt(std::ceil(value));
+}
+
+}  // namespace gfx
+