var initialize_TimeTracker = function() {

InspectorTest.runPerformanceTest = function(perfTest, executeTime, callback)
{
    var Timer = function(test, callback)
    {
        this._callback = callback;
        this._test = test;
        this._times = {};
        this._sizes = {};
        this._testStartTime = new Date();
        this._heapSizeDeltas = [];
        this._jsHeapSize = this._getJSHeapSize();
    }

    Timer.prototype = {
        start: function(name)
        {
            return {name: name, startTime: new Date()};
        },

        finish: function(cookie)
        {
            var endTime = new Date();
            if (!this._times[cookie.name])
                this._times[cookie.name] = [];
            this._times[cookie.name].push(endTime - cookie.startTime);
        },

        reportSize: function(name, size)
        {
            if (!this._sizes[name])
                this._sizes[name] = [];
            this._sizes[name].push(size);
        },

        _getJSHeapSize: function()
        {
            if (window.gc) {
                window.gc();
                window.gc();
            }
            return console.memory.usedJSHeapSize;
        },

        done: function(groupName)
        {
            var newJSHeapSize = this._getJSHeapSize();
            this._heapSizeDeltas.push(newJSHeapSize - this._jsHeapSize);
            this._jsHeapSize = newJSHeapSize;

            var time = new Date();
            if (time - this._testStartTime < executeTime)
                this._runTest();
            else {
                if (this._complete)
                    return;
                this._complete = true;

                this._dump(groupName);
                if (this._callback)
                    this._callback();
                else
                    InspectorTest.completeTest();
            }
        },

        _runTest: function()
        {
            if (this._guard) {
                setTimeout(this._runTest.bind(this), 0);
                return;
            }

            this._guard = true;
            var safeTest = InspectorTest.safeWrap(this._test);
            safeTest(this);
            this._guard = false;
        },

        _dump: function(groupName)
        {
            for (var testName in this._times)
                InspectorTest.dumpTestStats(groupName, testName, this._times[testName], "ms");

            for (var testName in this._sizes)
                InspectorTest.dumpTestStats(groupName, testName, this._sizes[testName], "kB", 1024);

            var url = WebInspector.inspectedPageURL;
            var regExp = /([^\/]+)\.html/;
            var matches = regExp.exec(url);
            InspectorTest.dumpTestStats("heap-delta", matches[1], this._heapSizeDeltas, "kB", 1024);
        },
    }

    InspectorTest.timer = new Timer(perfTest, callback);
    InspectorTest.timer._runTest();
}

InspectorTest.measureFunction = function(object, functionName)
{
    function measure() {
        var timer = InspectorTest.timer;
        var cookie;
        if (timer)
            cookie = timer.start(functionName);
        var result = func.apply(this, arguments);

        if (timer)
            timer.finish(cookie);
        return result;
    }
    var func = object[functionName];
    object[functionName] = measure;
}

InspectorTest.mark = function(markerName)
{
    var timer = InspectorTest.timer;
    if (!timer)
        return;

    if (InspectorTest.lastMarkCookie)
        timer.finish(InspectorTest.lastMarkCookie);

    InspectorTest.lastMarkCookie = markerName ? timer.start(markerName) : null;
}

InspectorTest.dumpTestStats = function(groupName, testName, samples, units, divider)
{
    divider = divider || 1;
    var stripNResults = Math.floor(samples.length / 10);
    samples.sort(function(a, b) { return a - b; });
    var sum = 0;
    for (var i = stripNResults; i < samples.length - stripNResults; ++i)
        sum += samples[i];
    InspectorTest.addResult("RESULT " + groupName + ': ' + testName + "= " + Math.floor(sum / (samples.length - stripNResults * 2) / divider) + " " + units);
}

InspectorTest.addBackendResponseSniffer = function(object, methodName, override, opt_sticky)
{
    var originalMethod = InspectorTest.override(object, methodName, backendCall, opt_sticky);
    function backendCall()
    {
        var args = Array.prototype.slice.call(arguments);
        var callback = (args.length && typeof args[args.length - 1] === "function") ? args.pop() : 0;
        args.push(function() {
            callback.apply(null, arguments);
            override.apply(null, arguments);
        });
        originalMethod.apply(object, args);
    }
}

}