DevTools: negative time on network filmstrip when reloading page while loading.

Source/devtools/front_end/components_lazy/FilmStripModel.js

 /*
  * Copyright 2015 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /**
  * @constructor
  * @param {!WebInspector.TracingModel} tracingModel
+ * @param {number=} zeroTime
  */
-WebInspector.FilmStripModel = function(tracingModel)
+WebInspector.FilmStripModel = function(tracingModel, zeroTime)
 {
     this._tracingModel = tracingModel;
+    this._zeroTime = zeroTime || tracingModel.minimumRecordTime();
 
     /** @type {!Array<!WebInspector.FilmStripModel.Frame>} */
     this._frames = [];
 
     var browserProcess = tracingModel.processByName("Browser");
     if (!browserProcess)
         return;
     var mainThread = browserProcess.threadByName("CrBrowserMain");
     if (!mainThread)
         return;
 
     var events = mainThread.events();
     for (var i = 0; i < events.length; ++i) {
-        if (!events[i].hasCategory(WebInspector.FilmStripModel._category))
+        var event = events[i];
+        if (event.startTime < this._zeroTime)
             continue;
-
-        if (events[i].name === WebInspector.FilmStripModel.TraceEvents.CaptureFrame) {
-            var data = events[i].args["data"];
+        if (!event.hasCategory(WebInspector.FilmStripModel._category))
+            continue;
+        if (event.name === WebInspector.FilmStripModel.TraceEvents.CaptureFrame) {
+            var data = event.args["data"];
             if (data)
-                this._frames.push(WebInspector.FilmStripModel.Frame._fromEvent(this, events[i], this._frames.length));
-        } else if (events[i].name === WebInspector.FilmStripModel.TraceEvents.Screenshot) {
-            this._frames.push(WebInspector.FilmStripModel.Frame._fromSnapshot(this, /** @type {!WebInspector.TracingModel.ObjectSnapshot} */ (events[i]), this._frames.length));
+                this._frames.push(WebInspector.FilmStripModel.Frame._fromEvent(this, event, this._frames.length));
+        } else if (event.name === WebInspector.FilmStripModel.TraceEvents.Screenshot) {
+            this._frames.push(WebInspector.FilmStripModel.Frame._fromSnapshot(this, /** @type {!WebInspector.TracingModel.ObjectSnapshot} */ (event), this._frames.length));
         }
     }
 }
 
 WebInspector.FilmStripModel._category = "disabled-by-default-devtools.screenshot";
 
 WebInspector.FilmStripModel.TraceEvents = {
     CaptureFrame: "CaptureFrame",
     Screenshot: "Screenshot"
 }
 
 WebInspector.FilmStripModel.prototype = {
     /**
      * @return {!Array<!WebInspector.FilmStripModel.Frame>}
      */
     frames: function()
     {
         return this._frames;
     },
 
     /**
      * @return {number}
      */
     zeroTime: function()
     {
-        return this._tracingModel.minimumRecordTime();
+        return this._zeroTime;
     },
 
     /**
      * @param {number} timestamp
      * @return {?WebInspector.FilmStripModel.Frame}
      */
     frameByTimestamp: function(timestamp)
     {
         /**
          * @param {number} timestamp
@@ skipping 65 matching lines @@
      * @return {!Promise<?string>}
      */
     imageDataPromise: function()
     {
         if (this._imageData || !this._snapshot)
             return Promise.resolve(this._imageData);
 
         return /** @type {!Promise<?string>} */ (this._snapshot.objectPromise());
     }
 }