Refactor Scroll Customization to share cc::ScrollStateData with blink.

cc/input/scroll_state.cc

Index: cc/input/scroll_state.cc
diff --git a/cc/input/scroll_state.cc b/cc/input/scroll_state.cc
index 419b5904363ea02be74552f7a0ece21d7b441560..d70d7d4efc04b44eac8b7e04ace6c22444e263dd 100644
--- a/cc/input/scroll_state.cc
+++ b/cc/input/scroll_state.cc
@@ -20,8 +20,8 @@ ScrollState::ScrollState(double delta_x,
                          bool is_in_inertial_phase,
                          bool is_ending,
                          bool should_propagate,
-                         bool delta_consumed_for_scroll_sequence,
-                         bool is_direct_manipulation)
+                         bool is_direct_manipulation,
+                         bool delta_consumed_for_scroll_sequence)
     : data_(delta_x,
             delta_y,
             start_position_x,
@@ -32,8 +32,10 @@ ScrollState::ScrollState(double delta_x,
             is_in_inertial_phase,
             is_ending,
             should_propagate,
-            delta_consumed_for_scroll_sequence,
-            is_direct_manipulation) {}
+            true,  // TODO(tdresser): populate from_user_input.
+            is_direct_manipulation,
+            0,  // TODO(tdresser): populate delta_granularity.
+            delta_consumed_for_scroll_sequence) {}
 
 ScrollState::ScrollState(ScrollStateData data) : data_(data) {}