Move inspected target events calculation into TracingTimelineModel

LayoutTests/inspector/layers/tracing-layer-tree.html

Index: LayoutTests/inspector/layers/tracing-layer-tree.html
diff --git a/LayoutTests/inspector/layers/tracing-layer-tree.html b/LayoutTests/inspector/layers/tracing-layer-tree.html
index 88c60da7734fce99d70b330e61d2f7c93760a764..c574b7749e9613055f5239672c4b4a31792522a2 100644
--- a/LayoutTests/inspector/layers/tracing-layer-tree.html
+++ b/LayoutTests/inspector/layers/tracing-layer-tree.html
@@ -30,9 +30,13 @@ function test()
     var target = /** @type {!WebInspector.Target} */ (WebInspector.targetManager.activeTarget());
     var layerTree = new WebInspector.TracingLayerTree(target);
 
+    var tracineTimelineModel = new WebInspector.TracingTimelineModel(InspectorTest.tracingModel);
+    tracineTimelineModel.willStartRecordingTraceEvents();
+
     function onTracingComplete()
     {
-        var events = InspectorTest.tracingModel.inspectedTargetEvents();
+        tracineTimelineModel.didStopRecordingTraceEvents();
+        var events = tracineTimelineModel.inspectedTargetEvents();
         for (var i = events.length - 1; i >= 0; --i) {
             if (events[i].phase === WebInspector.TracingModel.Phase.SnapshotObject && events[i].name === "cc::LayerTreeHostImpl") {
                 var rootLayer = events[i].args["snapshot"]["active_tree"]["root_layer"];