Implement CSS: scroll-boundary-behavior

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 c32c208ff13c6c885098244610ff9c81026912a0..c4d903684506a5890c18f636abdb6fff1b65ae0a 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -23,6 +23,7 @@
 #include "cc/cc_export.h"
 #include "cc/debug/layer_tree_debug_state.h"
 #include "cc/input/input_handler.h"
+#include "cc/input/scroll_boundary_behavior.h"
 #include "cc/layers/draw_properties.h"
 #include "cc/layers/layer_collections.h"
 #include "cc/layers/layer_impl_test_properties.h"
@@ -295,6 +296,11 @@ class CC_EXPORT LayerImpl {
   gfx::ScrollOffset ClampScrollOffsetToLimits(gfx::ScrollOffset offset) const;
   gfx::Vector2dF ClampScrollToMaxScrollOffset();
 
+  void SetScrollBoundaryBehavior(const ScrollBoundaryBehavior&);
+  ScrollBoundaryBehavior scroll_boundary_behavior() {
+    return scroll_boundary_behavior_;
+  }
+
   // Returns the delta of the scroll that was outside of the bounds of the
   // initial scroll
   gfx::Vector2dF ScrollBy(const gfx::Vector2dF& scroll);
@@ -565,6 +571,7 @@ class CC_EXPORT LayerImpl {
   bool needs_show_scrollbars_ : 1;
 
   bool raster_even_if_not_in_rsll_ : 1;
+  ScrollBoundaryBehavior scroll_boundary_behavior_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };