Support warning decorations in Timeline flame chart based on trace events

Source/devtools/front_end/timeline/TracingModel.js

Index: Source/devtools/front_end/timeline/TracingModel.js
diff --git a/Source/devtools/front_end/sdk/TracingModel.js b/Source/devtools/front_end/timeline/TracingModel.js
similarity index 93%
rename from Source/devtools/front_end/sdk/TracingModel.js
rename to Source/devtools/front_end/timeline/TracingModel.js
index 16c48114103a4da315c1eeb9229d0070b01d62cd..b08a0b506aefa4299c854d7f8561c64036d6a9a5 100644
--- a/Source/devtools/front_end/sdk/TracingModel.js
+++ b/Source/devtools/front_end/timeline/TracingModel.js
@@ -174,12 +174,38 @@ WebInspector.TracingModel.prototype = {
 
     _tracingComplete: function()
     {
+        this._calculateWarnings();
+
         this._active = false;
         if (!this._pendingStopCallback)
             return;
         this._pendingStopCallback();
         this._pendingStopCallback = null;
     },
+    
+    _calculateWarnings: function()
+    {
+        var events = this._inspectedTargetMainThreadEvents;
+        var currentScriptEvent = null;
+        for (var i = 0, l = events.length; i < l; i++) {
+            var event = events[i];
+            if (currentScriptEvent && event.startTime > currentScriptEvent.endTime)
+                currentScriptEvent = null;
+            if (event.name === WebInspector.TimelineModel.RecordType.Layout && currentScriptEvent)
+                this._eventToWarning.put(event, WebInspector.UIString("Forced synchronous layout is a possible performance bottleneck."));
+            if (event.name === WebInspector.TimelineModel.RecordType.EvaluateScript || event.name === WebInspector.TimelineModel.RecordType.FunctionCall)

[caseq, 2014/05/07 15:44:33]

Looks like this belongs to a higher level than tracing model. Can we do this
elsewhere?

[yurys, 2014/05/08 07:46:46]

Done. Extracted this code into TracingModel.EventBindings which will contain
derived data for the tracing model similar to InterRecordBingings in current
timeline implementation.

+                currentScriptEvent = event;
+        }
+    },
+
+    /**
+     * @param {!WebInspector.TracingModel.Event} event
+     * @return {?string}
+     */
+    eventWarning: function(event)
+    {
+        return this._eventToWarning.get(event);
+    },
 
     reset: function()
     {
@@ -192,6 +218,7 @@ WebInspector.TracingModel.prototype = {
         this._inspectedTargetMainThreadEvents = [];
         this._inspectedTargetLayerTreeHostId = 0;
         this._frameLifecycleEvents = [];
+        this._eventToWarning = new Map();
     },
 
     /**