First Implementation of Snapped Points

cc/layers/layer_impl.h

Index: cc/layers/layer_impl.h
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index 5fa037d0842fe7da399732ca935c48c7af5d97b7..006b9f9a3052858f3095ae1c076c01b6b24f2faa 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -29,6 +29,7 @@
 #include "cc/layers/layer_position_constraint.h"
 #include "cc/layers/performance_properties.h"
 #include "cc/layers/render_surface_impl.h"
+#include "cc/layers/snap_point_list.h"
 #include "cc/quads/shared_quad_state.h"
 #include "cc/resources/resource_provider.h"
 #include "cc/tiles/tile_priority.h"
@@ -298,6 +299,14 @@ class CC_EXPORT LayerImpl {
   gfx::ScrollOffset ClampScrollOffsetToLimits(gfx::ScrollOffset offset) const;
   gfx::Vector2dF ClampScrollToMaxScrollOffset();
 
+  void SetScrollSnapOffsets(const SnapPointList& offsets);
+  std::vector<SnapPoint> snap_offsets_horizontal() {
+    return snap_offsets_.horizontal;
+  }
+  std::vector<SnapPoint> snap_offsets_vertical() {
+    return snap_offsets_.vertical;
+  }
+
   // Returns the delta of the scroll that was outside of the bounds of the
   // initial scroll
   gfx::Vector2dF ScrollBy(const gfx::Vector2dF& scroll);
@@ -515,6 +524,8 @@ class CC_EXPORT LayerImpl {
   int clip_tree_index_;
   int scroll_tree_index_;
 
+  SnapPointList snap_offsets_;
+
  protected:
   friend class TreeSynchronizer;