Do not convert from RectF to Rect by flooring.

ui/gfx/rect_f.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_F_H_
 #define UI_GFX_RECT_F_H_
 
 #include <string>
 
 #include "ui/gfx/point_f.h"
-#include "ui/gfx/rect.h"
 #include "ui/gfx/rect_base.h"
 #include "ui/gfx/size_f.h"
 
 namespace gfx {
 
 class InsetsF;
 
 // A floating version of gfx::Rect.
 class UI_EXPORT RectF : public RectBase<RectF, PointF, SizeF, InsetsF, float> {
  public:
   RectF();
   RectF(float width, float height);
   RectF(float x, float y, float width, float height);
   explicit RectF(const gfx::SizeF& size);
   RectF(const gfx::PointF& origin, const gfx::SizeF& size);
 
   ~RectF();
 
-  Rect ToRect() const;
+  /// Scales the rectangle by |scale|.
+  RectF Scale(float scale) const WARN_UNUSED_RESULT {
+    return Scale(scale, scale);
+  }
+
+  RectF Scale(float x_scale, float y_scale) const WARN_UNUSED_RESULT {
+    SizeF newSize = size().Scale(x_scale, y_scale);
+    newSize.ClampToNonNegative();
+    return RectF(origin().Scale(x_scale, y_scale), newSize);
+  }
 
   std::string ToString() const;
 };
 
 #if !defined(COMPILER_MSVC)
 extern template class RectBase<RectF, PointF, SizeF, InsetsF, float>;
 #endif
 
 }  // namespace gfx
 
-#endif  // UI_GFX_RECT_H_
+#endif  // UI_GFX_RECT_F_H_