Filter out workers started by other pages when showing Timeline based on trace events

BUG=401895
R=alph@chromium.org

Review URL: https://codereview.chromium.org/466343002

git-svn-id: svn://svn.chromium.org/blink/trunk@180167 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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

@@ -81,9 +81,17 @@ WebInspector.TracingModel.prototype = {
     /**
      * @return {!Array.<!WebInspector.TracingModel.Event>}
      */
-    devtoolsMetadataEvents: function()
+    devtoolsPageMetadataEvents: function()
     {
-        return this._devtoolsMetadataEvents;
+        return this._devtoolsPageMetadataEvents;
+    },
+
+    /**
+     * @return {!Array.<!WebInspector.TracingModel.Event>}
+     */
+    devtoolsWorkerMetadataEvents: function()
+    {
+        return this._devtoolsWorkerMetadataEvents;
     },
 
     /**
@@ -175,7 +183,8 @@ WebInspector.TracingModel.prototype = {
         this._minimumRecordTime = 0;
         this._maximumRecordTime = 0;
         this._sessionId = null;
-        this._devtoolsMetadataEvents = [];
+        this._devtoolsPageMetadataEvents = [];
+        this._devtoolsWorkerMetadataEvents = [];
         this._rawEvents = [];
     },
 
@@ -212,7 +221,11 @@ WebInspector.TracingModel.prototype = {
             if (event && event.name === WebInspector.TracingModel.DevToolsMetadataEvent.TracingStartedInPage &&
                 event.category === WebInspector.TracingModel.DevToolsMetadataEventCategory &&
                 event.args["sessionId"] === this._sessionId)
-                this._devtoolsMetadataEvents.push(event);
+                this._devtoolsPageMetadataEvents.push(event);
+            if (event && event.name === WebInspector.TracingModel.DevToolsMetadataEvent.TracingStartedInWorker &&
+                event.category === WebInspector.TracingModel.DevToolsMetadataEventCategory &&
+                event.args["sessionId"] === this._sessionId)
+                this._devtoolsWorkerMetadataEvents.push(event);
             return;
         }
         switch (payload.name) {

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

@@ -212,7 +212,8 @@ WebInspector.TracingTimelineModel.prototype = {
     _didStopRecordingTraceEvents: function()
     {
         this._stopCallbackBarrier = null;
-        var events = this._tracingModel.devtoolsMetadataEvents();
+        var events = this._tracingModel.devtoolsPageMetadataEvents();
+        var workerMetadataEvents = this._tracingModel.devtoolsWorkerMetadataEvents();
         events.sort(WebInspector.TracingModel.Event.compareStartTime);
 
         this._resetProcessingState();
@@ -225,7 +226,13 @@ WebInspector.TracingTimelineModel.prototype = {
             if (i + 1 < length)
                 endTime = events[i + 1].startTime;
 
-            process.sortedThreads().forEach(this._processThreadEvents.bind(this, startTime, endTime, event.thread));
+            var threads = process.sortedThreads();
+            for (var j = 0; j < threads.length; j++) {
+                var thread = threads[j];
+                if (thread.name() === "WebCore: Worker" && !workerMetadataEvents.some(function(e) { return e.thread === thread; }))
+                    continue;
+                this._processThreadEvents(startTime, endTime, event.thread, thread);
+            }
         }
         this._resetProcessingState();