Add a telemetry measurement for property tree performance.

cc/trees/layer_tree_host_common.cc

Index: cc/trees/layer_tree_host_common.cc
diff --git a/cc/trees/layer_tree_host_common.cc b/cc/trees/layer_tree_host_common.cc
index 308820758d1d78df245ddb945b56fc599c9a6939..7b46153ab11374304b6dd91a15dc4b57d400fb25 100644
--- a/cc/trees/layer_tree_host_common.cc
+++ b/cc/trees/layer_tree_host_common.cc
@@ -2506,14 +2506,15 @@ void LayerTreeHostCommon::CalculateDrawProperties(
   PreCalculateMetaInformationRecursiveData recursive_data;
   PreCalculateMetaInformation(inputs->root_layer, &recursive_data);
   std::vector<AccumulatedSurfaceState<Layer>> accumulated_surface_state;
-  CalculateDrawPropertiesInternal<Layer>(
-      inputs->root_layer,
-      globals,
-      data_for_recursion,
-      inputs->render_surface_layer_list,
-      &dummy_layer_list,
-      &accumulated_surface_state,
-      inputs->current_render_surface_layer_list_id);
+  {
+    TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cc.debug.cdp-perf"),

[enne (OOO), 2015/02/17 17:40:14]

You should include the precalculate meta-information step here too, I think.

[Ian Vollick, 2015/02/18 05:22:43]

Done.

+                 "LayerTreeHostCommon::CalculateDrawProperties");
+    CalculateDrawPropertiesInternal<Layer>(
+        inputs->root_layer, globals, data_for_recursion,
+        inputs->render_surface_layer_list, &dummy_layer_list,
+        &accumulated_surface_state,
+        inputs->current_render_surface_layer_list_id);
+  }
 
   // The dummy layer list should not have been used.
   DCHECK_EQ(0u, dummy_layer_list.size());
@@ -2526,11 +2527,15 @@ void LayerTreeHostCommon::CalculateDrawProperties(
     // will eventually get these data passed directly to the compositor.
     TransformTree transform_tree;
     ClipTree clip_tree;
-    ComputeVisibleRectsUsingPropertyTrees(
-        inputs->root_layer, inputs->page_scale_application_layer,
-        inputs->page_scale_factor, inputs->device_scale_factor,
-        gfx::Rect(inputs->device_viewport_size), inputs->device_transform,
-        &transform_tree, &clip_tree);
+    {
+      TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cc.debug.cdp-perf"),
+                   "LayerTreeHostCommon::ComputeVisibleRectsWithPropertyTrees");
+      ComputeVisibleRectsUsingPropertyTrees(
+          inputs->root_layer, inputs->page_scale_application_layer,
+          inputs->page_scale_factor, inputs->device_scale_factor,
+          gfx::Rect(inputs->device_viewport_size), inputs->device_transform,
+          &transform_tree, &clip_tree);
+    }
 
     LayerIterator<Layer> it, end;
     for (it = LayerIterator<Layer>::Begin(inputs->render_surface_layer_list),