cc: Fix badly-scoped trace event for CDP in LTH::DoUpdateLayers

cc/trees/layer_tree_host.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.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 801 matching lines @@
   Layer* root_scroll = FindFirstScrollableLayer(root_layer);
   Layer* page_scale_layer = page_scale_layer_.get();
   if (!page_scale_layer && root_scroll)
     page_scale_layer = root_scroll->parent();
 
   if (hud_layer_.get()) {
     hud_layer_->PrepareForCalculateDrawProperties(device_viewport_size(),
                                                   device_scale_factor_);
   }
 
-
-  TRACE_EVENT0("cc", "LayerTreeHost::UpdateLayers::CalcDrawProps");
-
-  LayerTreeHostCommon::PreCalculateMetaInformation(root_layer);
-
   gfx::Transform identity_transform;
   LayerList update_layer_list;
 
   {
+    TRACE_EVENT0("cc", "LayerTreeHost::UpdateLayers::BuildPropertyTrees");
     TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cc.debug.cdp-perf"),
                  "LayerTreeHostCommon::ComputeVisibleRectsWithPropertyTrees");
+    LayerTreeHostCommon::PreCalculateMetaInformation(root_layer);
     bool can_render_to_separate_surface = true;
     BuildPropertyTreesAndComputeVisibleRects(
         root_layer, page_scale_layer, inner_viewport_scroll_layer_.get(),
         outer_viewport_scroll_layer_.get(), overscroll_elasticity_layer_.get(),
         elastic_overscroll_, page_scale_factor_, device_scale_factor_,
         gfx::Rect(device_viewport_size_), identity_transform,
         can_render_to_separate_surface, &property_trees_, &update_layer_list);
   }
 
   for (const auto& layer : update_layer_list)
@@ skipping 593 matching lines @@
 
   // It is required to create new PropertyTrees before deserializing it.
   property_trees_ = PropertyTrees();
   property_trees_.FromProtobuf(proto.property_trees());
 
   surface_id_namespace_ = proto.surface_id_namespace();
   next_surface_sequence_ = proto.next_surface_sequence();
 }
 
 }  // namespace cc