Convert scroll offsets to use SyncedProperty.

cc/layers/layer.h

 // Copyright 2010 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_LAYERS_LAYER_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 293 matching lines @@
   }
 
   void SetDrawCheckerboardForMissingTiles(bool checkerboard);
   bool draw_checkerboard_for_missing_tiles() const {
     return draw_checkerboard_for_missing_tiles_;
   }
 
   void SetForceRenderSurface(bool force_render_surface);
   bool force_render_surface() const { return force_render_surface_; }
 
-  gfx::Vector2dF ScrollDelta() const { return gfx::Vector2dF(); }
-  gfx::ScrollOffset TotalScrollOffset() const {
-    return ScrollOffsetWithDelta(scroll_offset(), ScrollDelta());
-  }
+  gfx::ScrollOffset ScrollDelta() const { return gfx::ScrollOffset(); }
+  gfx::ScrollOffset CurrentScrollOffset() const { return scroll_offset_; }
 
   void SetDoubleSided(bool double_sided);
   bool double_sided() const { return double_sided_; }
 
   void SetShouldFlattenTransform(bool flatten);
   bool should_flatten_transform() const { return should_flatten_transform_; }
 
   bool Is3dSorted() const { return sorting_context_id_ != 0; }
 
   void set_use_parent_backface_visibility(bool use) {
@@ skipping 264 matching lines @@
   // trigger a Commit.
   void SetHasRenderSurface(bool has_render_surface);
 
   // Returns the index of the child or -1 if not found.
   int IndexOfChild(const Layer* reference);
 
   // This should only be called from RemoveFromParent().
   void RemoveChildOrDependent(Layer* child);
 
   // LayerAnimationValueProvider implementation.
-  gfx::ScrollOffset ScrollOffsetForAnimation() const override;
+  gfx::ScrollOffset ScrollOffsetForAnimation() override;
 
   // LayerAnimationValueObserver implementation.
   void OnFilterAnimated(const FilterOperations& filters) override;
   void OnOpacityAnimated(float opacity) override;
   void OnTransformAnimated(const gfx::Transform& transform) override;
   void OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset) override;
   void OnAnimationWaitingForDeletion() override;
   bool IsActive() const override;
 
   // If this layer has a scroll parent, it removes |this| from its list of
@@ skipping 83 matching lines @@
   // and should get removed once it is no longer needed on main thread.
   scoped_ptr<RenderSurface> render_surface_;
 
   gfx::Rect visible_rect_from_property_trees_;
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_