gfx: Make conversions from Size to SizeF be explicit.

cc/input/page_scale_animation.h

 // Copyright 2011 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 CC_INPUT_PAGE_SCALE_ANIMATION_H_
 #define CC_INPUT_PAGE_SCALE_ANIMATION_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "cc/base/cc_export.h"
-#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/geometry/size_f.h"
 #include "ui/gfx/geometry/vector2d.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
 namespace cc {
 
 class TimingFunction;
 
 // Used in the CC to pass around a scale animation that hasn't yet been
 // initialized.
 struct PendingPageScaleAnimation {
@@ skipping 103 matching lines @@
   base::TimeDelta duration_;
 
   scoped_ptr<TimingFunction> timing_function_;
 
   DISALLOW_COPY_AND_ASSIGN(PageScaleAnimation);
 };
 
 }  // namespace cc
 
 #endif  // CC_INPUT_PAGE_SCALE_ANIMATION_H_