DevTools: Initial implementation of line-level CPU profile.

third_party/WebKit/Source/devtools/front_end/timeline/TimelineModel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 711 matching lines @@
         var events = thread.events();
         var asyncEvents = thread.asyncEvents();
 
         var jsSamples;
         if (Runtime.experiments.isEnabled("timelineTracingJSProfile")) {
             jsSamples = WebInspector.TimelineJSProfileProcessor.processRawV8Samples(events);
         } else {
             var cpuProfileEvent = events.peekLast();
             if (cpuProfileEvent && cpuProfileEvent.name === WebInspector.TimelineModel.RecordType.CpuProfile) {
                 var cpuProfile = cpuProfileEvent.args["data"]["cpuProfile"];
-                if (cpuProfile)
-                    jsSamples = WebInspector.TimelineJSProfileProcessor.generateTracingEventsFromCpuProfile(cpuProfile, thread);
+                if (cpuProfile) {
+                    var jsProfileModel = new WebInspector.CPUProfileDataModel(cpuProfile);

[caseq, 2016/03/11 22:52:05]

Can we take it out of model?

[alph, 2016/03/12 00:47:54]

Done.

+                    WebInspector.TimelineJSProfileProcessor.buildLineLevelProfiles(jsProfileModel);
+                    jsSamples = WebInspector.TimelineJSProfileProcessor.generateTracingEventsFromCpuProfile(jsProfileModel, thread);
+                }
             }
         }
 
         if (jsSamples && jsSamples.length)
             events = events.mergeOrdered(jsSamples, WebInspector.TracingModel.Event.orderedCompareStartTime);
         if (jsSamples || events.some(function(e) { return e.name === WebInspector.TimelineModel.RecordType.JSSample; })) {
             var jsFrameEvents = WebInspector.TimelineJSProfileProcessor.generateJSFrameEvents(events);
             if (jsFrameEvents && jsFrameEvents.length)
                 events = jsFrameEvents.mergeOrdered(events, WebInspector.TracingModel.Event.orderedCompareStartTime);
         }
@@ skipping 972 matching lines @@
         if (!id)
             return;
         /** @type {!Map<string, !WebInspector.TracingModel.Event>|undefined} */
         var initiatorMap = this._initiatorByType.get(initiatorType);
         if (isInitiator)
             initiatorMap.set(id, event);
         else
             event.initiator = initiatorMap.get(id) || null;
     }
 }