DevTools: extract CPU profile independent part of CPUProfileNode.

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

+// Copyright 2016 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
+ * @implements {RuntimeAgent.CallFrame}

[caseq, 2016/04/13 17:21:12]

WAT?

[alph, 2016/04/13 19:05:07]

Fixed. Encapsulated it instead and added getters to retain compatibility.

+ */
+WebInspector.ProfileNode = function()
+{
+    /** @type {string} */
+    this.functionName;
+    /** @type {string} */
+    this.scriptId;
+    /** @type {string} */
+    this.url;
+    /** @type {number} */
+    this.lineNumber;
+    /** @type {number} */
+    this.columnNumber;
+    /** @type {number} */
+    this.callUID;
+    /** @type {number} */
+    this.self = 0;
+    /** @type {number} */
+    this.total = 0;
+    /** @type {number} */
+    this.id = 0;
+    /** @type {?WebInspector.ProfileNode} */
+    this.parent = null;
+    /** @type {!Array<!WebInspector.ProfileNode>} */
+    this.children = [];
+}
+
+/**
+ * @constructor
+ * @param {!WebInspector.ProfileNode} head

[caseq, 2016/04/13 17:21:12]

nit: s/head/root/ everywhere?

[alph, 2016/04/13 19:05:07]

Renamed local variables. Left the rest for now to keep the patch small.

+ * @param {number} begin
+ * @param {number} end
+ */
+WebInspector.ProfileTreeModel = function(head, begin, end)
+{
+    this.head = head;
+    this.begin = begin;
+    this.end = end;
+    this._assignInfo();
+    this._calculateTotal(this.head);
+}
+
+WebInspector.ProfileTreeModel.prototype = {
+    _assignInfo: function()

[caseq, 2016/04/13 17:21:12]

_updateDepthAndParent?

[alph, 2016/04/13 19:05:07]

Done.

+    {
+        var head = this.head;
+        head.depth = -1;
+        head.parent = null;
+        this.maxDepth = 0;
+        var nodesToTraverse = [ head ];
+        while (nodesToTraverse.length) {
+            var parent = nodesToTraverse.pop();
+            var depth = parent.depth + 1;
+            if (depth > this.maxDepth)
+                this.maxDepth = depth;
+            var children = parent.children;
+            var length = children.length;
+            for (var i = 0; i < length; ++i) {
+                var child = children[i];
+                child.depth = depth;
+                child.parent = parent;
+                if (child.children.length)
+                    nodesToTraverse.push(child);
+            }
+        }
+    },
+
+    /**
+     * @param {!WebInspector.ProfileNode} node
+     * @return {number}
+     */
+    _calculateTotal: function(node)
+    {
+        node.total = node.children.reduce((acc, child) => acc + this._calculateTotal(child), node.self);
+        return node.total;
+    }
+}