Do not convert from RectF to Rect by flooring.

ui/gfx/safe_floor_ceil.h

Index: ui/gfx/safe_floor_ceil.h
diff --git a/ui/gfx/safe_floor_ceil.h b/ui/gfx/safe_floor_ceil.h
new file mode 100644
index 0000000000000000000000000000000000000000..c2d80c6406397c553cb416338cb1c9cea12cbaa8
--- /dev/null
+++ b/ui/gfx/safe_floor_ceil.h
@@ -0,0 +1,16 @@
+// 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_SAFE_FLOOR_CEIL_H_
+#define UI_GFX_SAFE_FLOOR_CEIL_H_
+
+namespace gfx {
+
+UI_EXPORT int ClampToInt(float value);
+UI_EXPORT int ToFlooredInt(float value);
+UI_EXPORT int ToCeiledInt(float value);
+
+}  // namespace gfx
+
+#endif  // UI_GFX_SAFE_FLOOR_CEIL_H_