Make scroll offset type of float in cc

cc/animation/layer_animation_value_provider.h

Index: cc/animation/layer_animation_value_provider.h
diff --git a/cc/animation/layer_animation_value_provider.h b/cc/animation/layer_animation_value_provider.h
index c81496883ed1f1cc019b65fe7e60ceda404b80c2..90708381561bb357d0664847c033e7c91b623bc5 100644
--- a/cc/animation/layer_animation_value_provider.h
+++ b/cc/animation/layer_animation_value_provider.h
@@ -6,10 +6,11 @@
 #define CC_ANIMATION_LAYER_ANIMATION_VALUE_PROVIDER_H_
 
 #include "cc/base/cc_export.h"
-#include "ui/gfx/vector2d_f.h"
 
 namespace cc {
 
+class ScrollOffset;
+
 // A LayerAnimationValueProvider is used for determining the starting value
 // for animations that start at their 'current' value rather than at a
 // pre-specified value.
@@ -17,7 +18,7 @@ class CC_EXPORT LayerAnimationValueProvider {
  public:
   virtual ~LayerAnimationValueProvider() {}
 
-  virtual gfx::Vector2dF ScrollOffsetForAnimation() const = 0;
+  virtual gfx::ScrollOffset ScrollOffsetForAnimation() const = 0;
 };
 
 }  // namespace cc