Make scroll offset type of float in cc

cc/base/math_util.h

 // Copyright 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 CC_BASE_MATH_UTIL_H_
 #define CC_BASE_MATH_UTIL_H_
 
 #include <algorithm>
 #include <cmath>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "ui/gfx/box_f.h"
+#include "ui/gfx/geometry/scroll_offset.h"
 #include "ui/gfx/point3_f.h"
 #include "ui/gfx/point_f.h"
 #include "ui/gfx/size.h"
 #include "ui/gfx/transform.h"
 
 namespace base {
 class Value;
 namespace debug {
 class TracedValue;
 }
@@ skipping 179 matching lines @@
   static void AddToTracedValue(const gfx::Rect& r,
                                base::debug::TracedValue* res);
   static void AddToTracedValue(const gfx::PointF& q,
                                base::debug::TracedValue* res);
   static void AddToTracedValue(const gfx::Point3F&,
                                base::debug::TracedValue* res);
   static void AddToTracedValue(const gfx::Vector2d& v,
                                base::debug::TracedValue* res);
   static void AddToTracedValue(const gfx::Vector2dF& v,
                                base::debug::TracedValue* res);
+  static void AddToTracedValue(const gfx::ScrollOffset& v,
+                               base::debug::TracedValue* res);
   static void AddToTracedValue(const gfx::QuadF& q,
                                base::debug::TracedValue* res);
   static void AddToTracedValue(const gfx::RectF& rect,
                                base::debug::TracedValue* res);
   static void AddToTracedValue(const gfx::Transform& transform,
                                base::debug::TracedValue* res);
   static void AddToTracedValue(const gfx::BoxF& box,
                                base::debug::TracedValue* res);
 
   // Returns a base::Value representation of the floating point value.
   // If the value is inf, returns max double/float representation.
   static double AsDoubleSafely(double value);
   static float AsFloatSafely(float value);
 };
 
 }  // namespace cc
 
 #endif  // CC_BASE_MATH_UTIL_H_