Make scroll offset type of float in cc

cc/blink/web_scroll_offset_animation_curve_impl.cc

 // Copyright 2014 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 "cc/blink/web_scroll_offset_animation_curve_impl.h"
 
 #include "cc/animation/scroll_offset_animation_curve.h"
 #include "cc/animation/timing_function.h"
 #include "cc/blink/web_animation_curve_common.h"
 
 using blink::WebFloatPoint;
 
 namespace cc_blink {
 
 WebScrollOffsetAnimationCurveImpl::WebScrollOffsetAnimationCurveImpl(
     WebFloatPoint target_value,
     TimingFunctionType timing_function)
     : curve_(cc::ScrollOffsetAnimationCurve::Create(
-          gfx::Vector2dF(target_value.x, target_value.y),
+          gfx::ScrollOffset(target_value.x, target_value.y),
           CreateTimingFunction(timing_function))) {
 }
 
 WebScrollOffsetAnimationCurveImpl::~WebScrollOffsetAnimationCurveImpl() {
 }
 
 blink::WebCompositorAnimationCurve::AnimationCurveType
 WebScrollOffsetAnimationCurveImpl::type() const {
   return WebCompositorAnimationCurve::AnimationCurveTypeScrollOffset;
 }
 
 void WebScrollOffsetAnimationCurveImpl::setInitialValue(
     WebFloatPoint initial_value) {
-  curve_->SetInitialValue(gfx::Vector2dF(initial_value.x, initial_value.y));
+  curve_->SetInitialValue(gfx::ScrollOffset(initial_value.x, initial_value.y));
 }
 
 WebFloatPoint WebScrollOffsetAnimationCurveImpl::getValue(double time) const {
-  gfx::Vector2dF value = curve_->GetValue(time);
+  gfx::ScrollOffset value = curve_->GetValue(time);
   return WebFloatPoint(value.x(), value.y());
 }
 
 double WebScrollOffsetAnimationCurveImpl::duration() const {
   return curve_->Duration();
 }
 
 scoped_ptr<cc::AnimationCurve>
 WebScrollOffsetAnimationCurveImpl::CloneToAnimationCurve() const {
   return curve_->Clone();
 }
 
 }  // namespace cc_blink