First Implementation of Snapped Points

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index c88721b0fa6e1e82ad3728900e1d3f93b7cc566b..af061fa5f80149fc5e1fb6f7b496c7f356b3f7eb 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -24,6 +24,7 @@
 #include "cc/input/input_handler.h"
 #include "cc/layers/layer_collections.h"
 #include "cc/layers/layer_position_constraint.h"
+#include "cc/layers/snap_point_list.h"
 #include "cc/paint/paint_record.h"
 #include "cc/trees/element_id.h"
 #include "cc/trees/mutator_host_client.h"
@@ -114,6 +115,8 @@ class CC_EXPORT Layer : public base::RefCounted<Layer> {
   void SetBounds(const gfx::Size& bounds);
   gfx::Size bounds() const { return inputs_.bounds; }
 
+  void SetScrollSnapOffsets(const SnapPointList& offsets);
+  SnapPointList snap_offsets() { return inputs_.snap_offsets; }
   void SetMasksToBounds(bool masks_to_bounds);
   bool masks_to_bounds() const { return inputs_.masks_to_bounds; }
 
@@ -593,6 +596,8 @@ class CC_EXPORT Layer : public base::RefCounted<Layer> {
     LayerClient* client;
     base::Callback<void(const gfx::ScrollOffset&)> did_scroll_callback;
     std::vector<std::unique_ptr<CopyOutputRequest>> copy_requests;
+
+    SnapPointList snap_offsets;
   };
 
   Layer* parent_;