cc : Calculate jitter without using layer hierarchy

cc/trees/layer_tree_host_impl_unittest.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_host_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 10356 matching lines @@
             ->scroll_tree.GetScrollOffsetBaseForTesting(
                 last_scrolled_layer->id());
     pending_tree->property_trees()->needs_rebuild = true;
     pending_tree->BuildPropertyTreesForTesting();
     pending_tree->property_trees()
         ->scroll_tree.UpdateScrollOffsetBaseForTesting(
             last_scrolled_layer->id(), pending_base);
 
     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 =
         (i == pending_tree->kFixedPointHitsThreshold) ? 500 : 0;
     EXPECT_EQ(jitter, expected_jitter);
   }
 }
 
 }  // namespace
 }  // namespace cc