Touchpad scroll latching enabled for Mac behind flag.

cc/trees/layer_tree_host_unittest_scroll.cc

Index: cc/trees/layer_tree_host_unittest_scroll.cc
diff --git a/cc/trees/layer_tree_host_unittest_scroll.cc b/cc/trees/layer_tree_host_unittest_scroll.cc
index ab0086c4a81fa24b435a1a5c5501d462e9cd1458..ea170e8b14642658deaa3f9316262d142a3b8e7b 100644
--- a/cc/trees/layer_tree_host_unittest_scroll.cc
+++ b/cc/trees/layer_tree_host_unittest_scroll.cc
@@ -689,6 +689,7 @@ class LayerTreeHostScrollTestCaseWithChild : public LayerTreeHostScrollTest {
         LayerImpl* scrolling_layer = impl->CurrentlyScrollingLayer();
         CHECK(scrolling_layer);
         impl->ScrollEnd(EndState().get());
+        impl->ClearCurrentlyScrollingLayerForTesting();
         CHECK(!impl->CurrentlyScrollingLayer());
         EXPECT_EQ(scrolling_layer->id(),
                   impl->active_tree()->LastScrolledLayerId());