DevTools: Move usedHeapSize from TimelineEvent into counters.

Source/devtools/front_end/TimelineMemoryOverview.js

 /*
  * Copyright (C) 2013 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 39 matching lines @@
         var records = this._model.records;
         if (!records.length)
             return;
 
         const lowerOffset = 3;
         var maxUsedHeapSize = 0;
         var minUsedHeapSize = 100000000000;
         var minTime = this._model.minimumRecordTime();
         var maxTime = this._model.maximumRecordTime();
         WebInspector.TimelinePresentationModel.forAllRecords(records, function(r) {
-            maxUsedHeapSize = Math.max(maxUsedHeapSize, r.usedHeapSize || maxUsedHeapSize);
-            minUsedHeapSize = Math.min(minUsedHeapSize, r.usedHeapSize || minUsedHeapSize);
+            if (!r.counters || !r.counters.jsHeapSizeUsed)
+                return;
+            maxUsedHeapSize = Math.max(maxUsedHeapSize, r.counters.jsHeapSizeUsed);
+            minUsedHeapSize = Math.min(minUsedHeapSize, r.counters.jsHeapSizeUsed);
         });
         minUsedHeapSize = Math.min(minUsedHeapSize, maxUsedHeapSize);
 
         var width = this._canvas.width;
         var height = this._canvas.height - lowerOffset;
         var xFactor = width / (maxTime - minTime);
         var yFactor = height / Math.max(maxUsedHeapSize - minUsedHeapSize, 1);
 
         var histogram = new Array(width);
         WebInspector.TimelinePresentationModel.forAllRecords(records, function(r) {
-            if (!r.usedHeapSize)
+            if (!r.counters || !r.counters.jsHeapSizeUsed)
                 return;
             var x = Math.round((WebInspector.TimelineModel.endTimeInSeconds(r) - minTime) * xFactor);
-            var y = (r.usedHeapSize - minUsedHeapSize) * yFactor;
+            var y = (r.counters.jsHeapSizeUsed - minUsedHeapSize) * yFactor;
             histogram[x] = Math.max(histogram[x] || 0, y);
         });
 
         var y = 0;
         var isFirstPoint = true;
         var ctx = this._context;
         ctx.save();
         ctx.translate(0.5, 0.5);
         ctx.beginPath();
         ctx.moveTo(-1, this._canvas.height);
@@ skipping 24 matching lines @@
         ctx.strokeStyle = "#666";
         ctx.stroke();
         ctx.restore();
 
         this._maxHeapSizeLabel.textContent = Number.bytesToString(maxUsedHeapSize);
         this._minHeapSizeLabel.textContent = Number.bytesToString(minUsedHeapSize);
     },
 
     __proto__: WebInspector.TimelineOverviewBase.prototype
 }