Add knowledge about blocking and passive event listeners.

cc/trees/layer_tree_host_impl_unittest.cc

Index: cc/trees/layer_tree_host_impl_unittest.cc
diff --git a/cc/trees/layer_tree_host_impl_unittest.cc b/cc/trees/layer_tree_host_impl_unittest.cc
index d67e6e3e695a7bfc3e5c9edc59f8ba3f827f7aee..eab2ff1dfcff261ddc985af5da2dec484b00031e 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -725,6 +725,15 @@ TEST_F(LayerTreeHostImplTest, ScrollBlocksOnWheelEventHandlers) {
   EXPECT_EQ(MainThreadScrollingReason::kEventHandlers,
             status.main_thread_scrolling_reasons);
 
+  host_impl_->active_tree()->set_event_listener_properties(
+      EventListenerClass::kMouseWheel,
+      EventListenerProperties::kBlockingAndPassive);
+  status = host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
+                                   InputHandler::WHEEL);
+  EXPECT_EQ(InputHandler::SCROLL_ON_MAIN_THREAD, status.thread);
+  EXPECT_EQ(MainThreadScrollingReason::kEventHandlers,
+            status.main_thread_scrolling_reasons);
+
   // But gesture scrolls can still be handled.
   status = host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
                                    InputHandler::GESTURE);