Use scroll-boundary-behavior to control overscroll-refresh/glow on android.

cc/input/scroll_state_data.h

Index: cc/input/scroll_state_data.h
diff --git a/cc/input/scroll_state_data.h b/cc/input/scroll_state_data.h
index ba33e46626bc2028fc32c012a0591a6cc2b9cf03..cb5ec626e07a08087f6ddce8787527065f93bbca 100644
--- a/cc/input/scroll_state_data.h
+++ b/cc/input/scroll_state_data.h
@@ -59,6 +59,13 @@ class CC_EXPORT ScrollStateData {
   bool caused_scroll_x;
   bool caused_scroll_y;
 
+  // Track if the scroll_chain has been cut by scroll_boundary_behavior, in
+  // order to properly handle overscroll-effects.
+  // TODO(sunyunjia): overscroll should be handled at the top of scroll_chain,
+  // as implemented at blink side. This field should be removed after it's
+  // resolved. crbug.com/755164.
+  bool is_scroll_chain_cut;
+
   ScrollNode* current_native_scrolling_node() const;
   void set_current_native_scrolling_node(
       ScrollNode* current_native_scrolling_node);