Add support for ordinal scroll amounts

ui/aura/root_window_unittest.cc

Index: ui/aura/root_window_unittest.cc
diff --git a/ui/aura/root_window_unittest.cc b/ui/aura/root_window_unittest.cc
index 8a5f26fb43c668ab66e575f1cbc7a6868d7d819b..cc2a857fd28ff7bbc972dbfd61cd85e66fb933c8 100644
--- a/ui/aura/root_window_unittest.cc
+++ b/ui/aura/root_window_unittest.cc
@@ -380,12 +380,24 @@ TEST_F(RootWindowTest, ScrollEventDispatch) {
   w1->SetBounds(gfx::Rect(20, 20, 40, 40));
 
   // A scroll event on the root-window itself is dispatched.
-  ui::ScrollEvent scroll1(ui::ET_SCROLL, gfx::Point(10, 10), now, 0, 0, -10, 2);
+  ui::ScrollEvent scroll1(ui::ET_SCROLL,
+                          gfx::Point(10, 10),
+                          now,
+                          0,
+                          0, -10,
+                          0, -10,
+                          2);
   root_window()->AsRootWindowHostDelegate()->OnHostScrollEvent(&scroll1);
   EXPECT_EQ(1, filter->num_scroll_events());
 
   // Scroll event on a window should be dispatched properly.
-  ui::ScrollEvent scroll2(ui::ET_SCROLL, gfx::Point(25, 30), now, 0, -10, 0, 2);
+  ui::ScrollEvent scroll2(ui::ET_SCROLL,
+                          gfx::Point(25, 30),
+                          now,
+                          0,
+                          -10, 0,
+                          -10, 0,
+                          2);
   root_window()->AsRootWindowHostDelegate()->OnHostScrollEvent(&scroll2);
   EXPECT_EQ(2, filter->num_scroll_events());
 }