DevTools: move recurring flag into AsyncTask, control cancelation from embedder only.

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

Index: third_party/WebKit/Source/devtools/front_end/timeline/TimelineFlameChart.js
diff --git a/third_party/WebKit/Source/devtools/front_end/timeline/TimelineFlameChart.js b/third_party/WebKit/Source/devtools/front_end/timeline/TimelineFlameChart.js
index e85439fe65bfda124757908bc255fff80bf977ed..1fbf4aa7416de577842eca9104cbe823e2a5d71e 100644
--- a/third_party/WebKit/Source/devtools/front_end/timeline/TimelineFlameChart.js
+++ b/third_party/WebKit/Source/devtools/front_end/timeline/TimelineFlameChart.js
@@ -337,7 +337,8 @@ Timeline.TimelineFlameChartDataProvider = class {
       var level = this._currentLevel + openEvents.length;
       if (flowEventsEnabled)
         this._appendFlowEvent(e, level);
-      this._appendEvent(e, level);
+      if (e.phase !== SDK.TracingModel.Phase.FlowEnd)
+        this._appendEvent(e, level);
       if (!isExtension && TimelineModel.TimelineModel.isMarkerEvent(e))
         this._timelineData.entryTotalTimes[this._entryData.length] = undefined;
 
@@ -744,6 +745,8 @@ Timeline.TimelineFlameChartDataProvider = class {
      * @return {number}
      */
     function pushStartFlow(event) {
+      if (event.args.name === 'Image')

[alph, 2017/03/14 00:39:37]

What's wrong with Image?

[pfeldman, 2017/03/14 01:15:10]

I'll drop it.

[caseq, 2017/03/14 01:15:43]

This is supposed to work for the generic case of flow events, having some logic
depending on what data the event carries, even without the regard to the name of
the event is not lgtm.

+        return -1;
       var flowIndex = timelineData.flowStartTimes.length;
       timelineData.flowStartTimes.push(event.startTime);
       timelineData.flowStartLevels.push(level);
@@ -755,6 +758,8 @@ Timeline.TimelineFlameChartDataProvider = class {
      * @param {number} flowIndex
      */
     function pushEndFlow(event, flowIndex) {
+      if (flowIndex < 0)
+        return;
       timelineData.flowEndTimes[flowIndex] = event.startTime;
       timelineData.flowEndLevels[flowIndex] = level;
     }