cc : Calculate jitter without using layer hierarchy

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 d81c3a8b4b790141b88935188548c5eff9792080..04d65929d60cd6d002d9fcd78e59467c4bc13bda 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -10374,8 +10374,7 @@ TEST_F(LayerTreeHostImplTest, JitterTest) {
 
     pending_tree->set_needs_update_draw_properties();
     pending_tree->UpdateDrawProperties(false);
-    float jitter =
-        LayerTreeHostCommon::CalculateFrameJitter(last_scrolled_layer);
+    float jitter = LayerTreeHostCommon::CalculateLayerJitter(content_layer);
     // There should not be any jitter measured till we hit the fixed point hits
     // threshold.
     float expected_jitter =