Always fall back to root scroll layer for otherwise ignored scrolls

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 f4c0c6b474a3e2c41d74f2f825f6c004e4905048..6113bd411955d19eb68eff06e979d046807bcee1 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -1780,7 +1780,7 @@ TEST_F(LayerTreeHostImplTest, ScrollNonScrollableRootWithTopControls) {
   host_impl_->active_tree()->FindRootScrollLayer();
   DrawFrame();
 
-  EXPECT_EQ(InputHandler::ScrollIgnored,
+  EXPECT_EQ(InputHandler::ScrollStarted,
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
 
   host_impl_->top_controls_manager()->ScrollBegin();
@@ -1788,6 +1788,8 @@ TEST_F(LayerTreeHostImplTest, ScrollNonScrollableRootWithTopControls) {
   host_impl_->top_controls_manager()->ScrollEnd();
   EXPECT_EQ(host_impl_->top_controls_manager()->content_top_offset(), 0.f);
 
+  host_impl_->ScrollEnd();
+
   EXPECT_EQ(InputHandler::ScrollStarted,
             host_impl_->ScrollBegin(gfx::Point(),
                                     InputHandler::Gesture));
@@ -2722,7 +2724,6 @@ TEST_F(LayerTreeHostImplTest, OverscrollChildEventBubbling) {
 
 TEST_F(LayerTreeHostImplTest, OverscrollAlways) {
   LayerTreeSettings settings;
-  settings.always_overscroll = true;
   CreateHostImpl(settings, CreateOutputSurface());
 
   SetupScrollAndContentsLayers(gfx::Size(50, 50));