DevTooos: Profiler domain refactoring: Make deoptReason and positionTicks fields optional.

third_party/WebKit/Source/devtools/front_end/sdk/CPUProfileDataModel.js

 // Copyright 2014 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
  * @extends {WebInspector.ProfileNode}
  * @param {!ProfilerAgent.CPUProfileNode} node
  * @param {number} sampleTime
  */
 WebInspector.CPUProfileNode = function(node, sampleTime)
 {
     var callFrame = node.callFrame || /** @type {!RuntimeAgent.CallFrame} */ ({
         // Backward compatibility for old SamplingHeapProfileNode format.
         functionName: node["functionName"],
         scriptId: node["scriptId"],
         url: node["url"],
         lineNumber: node["lineNumber"] - 1,
         columnNumber: node["columnNumber"] - 1
     });
     WebInspector.ProfileNode.call(this, callFrame);
     this.id = node.id;
     this.self = node.hitCount * sampleTime;
     this.positionTicks = node.positionTicks;
-    this.deoptReason = node.deoptReason;
+    // Compatibility: legacy backends could provide "no reason" for optimized functions.
+    this.deoptReason = node.deoptReason && node.deoptReason !== "no reason" ? node.deoptReason : null;
 }
 
 WebInspector.CPUProfileNode.prototype = {
     __proto__: WebInspector.ProfileNode.prototype
 }
 
 /**
  * @constructor
  * @extends {WebInspector.ProfileTreeModel}
  * @param {!ProfilerAgent.CPUProfile} profile
  */
 WebInspector.CPUProfileDataModel = function(profile)
 {
-    var isLegacyFormat = !!profile.head;
+    var isLegacyFormat = !!profile["head"];
     if (isLegacyFormat) {
         // Legacy format contains raw timestamps and start/stop times are in seconds.
         this.profileStartTime = profile.startTime * 1000;
         this.profileEndTime = profile.endTime * 1000;
         this.timestamps = profile.timestamps;
         this._compatibilityConversionHeadToNodes(profile);
     } else {
         // Current format encodes timestamps as deltas. Start/stop times are in microseconds.
         this.profileStartTime = profile.startTime / 1000;
         this.profileEndTime = profile.endTime / 1000;
@@ skipping 16 matching lines @@
      * @param {!ProfilerAgent.CPUProfile} profile
      */
     _compatibilityConversionHeadToNodes: function(profile)
     {
         if (!profile.head || profile.nodes)
             return;
         /** @type {!Array<!ProfilerAgent.CPUProfileNode>} */
         var nodes = [];
         convertNodesTree(profile.head);
         profile.nodes = nodes;
-        profile.head = null;
+        delete profile.head;
         /**
          * @param {!ProfilerAgent.CPUProfileNode} node
          * @return {number}
          */
         function convertNodesTree(node)
         {
             nodes.push(node);
             node.children = (/** @type {!Array<!ProfilerAgent.CPUProfileNode>} */(node.children)).map(convertNodesTree);
             return node.id;
         }
@@ skipping 262 matching lines @@
      * @param {number} index
      * @return {?WebInspector.CPUProfileNode}
      */
     nodeByIndex: function(index)
     {
         return this._idToNode.get(this.samples[index]) || null;
     },
 
     __proto__: WebInspector.ProfileTreeModel.prototype
 }