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

The CalcDrawProps trace event in DoUpdateLayers actually measures
almost all of DoUpdateLayers. This CL moves it to the right scope
and renames it to BuildPropertyTrees.

BUG=581774
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1641023002

Cr-Commit-Position: refs/heads/master@{#372092}

cc/trees/layer_tree_host.cc

@@ -820,17 +820,14 @@ bool LayerTreeHost::DoUpdateLayers(Layer* root_layer) {
                                                   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(),