refactor(perf): use webdriver to execute benchmarks

- use performance log of chromedriver / appium to get timeline data
  for calculating metrics for benchmarks
- change all benchmarks to be made of a standalone application
  and a protractor test that collectes timeline data
- fix and simplify benchmarks
- add dart2js to build
- remove benchpress

Closes #330

modules/benchpress/pubspec.yaml

@@ -1,4 +0,0 @@
-name: benchpress
-environment:
-  sdk: '>=1.4.0'
-dependencies:

modules/benchpress/src/benchpress.dart

@@ -1,63 +0,0 @@
-library benchmarks.benchpress;
-
-import 'dart:js' as js;
-import 'dart:html';
-import 'dart:async';
-
-// TODO: move the functionality of this module into benchpress and replace this
-// file with a Dart wrapper!
-
-var _benchmarkNames = [];
-
-_benchmarkId(index) {
-  return "benchmark${index}";
-}
-
-_useBenchmark(index) {
-  var search = window.location.search;
-  if (search.length > 0) {
-    search = search.substring(1);
-  }
-  if (search.length > 0) {
-    return search == _benchmarkId(index);
-  } else {
-    return true;
-  }
-}
-
-_onLoad(callback) {
-  var isReady = document.readyState == 'complete';
-  if (isReady) {
-    Timer.run(callback);
-  } else {
-    window.addEventListener('load', (event) => callback(), false);
-  }
-}
-
-_createBenchmarkMenu() {
-  var div = document.createElement('div');
-  div.innerHtml += '<h1>Benchmarks:</h1><a class="btn btn-default" href="?">All</a>';
-  for (var i=0; i<_benchmarkNames.length; i++) {
-    var activeClass = _useBenchmark(i) ? 'active' : '';
-    div.innerHtml += '<a class="btn btn-default ${activeClass}" href="?${_benchmarkId(i)}">${_benchmarkNames[i]}</a>';
-  }
-  document.body.insertBefore(div, document.body.childNodes[0]);
-}
-
-benchmark(name, stepsCreationCallback) {
-  _benchmarkNames.add(name);
-  if (_benchmarkNames.length == 2) {
-    _onLoad(_createBenchmarkMenu);
-  }
-  if (_useBenchmark(_benchmarkNames.length-1)) {
-    stepsCreationCallback();
-  }
-}
-
-benchmarkStep(name, callback) {
-  var benchmarkName = _benchmarkNames[_benchmarkNames.length-1];
-  js.context['benchmarkSteps'].add(new js.JsObject.jsify({
-      "name": benchmarkName + '#' + name,
-      "fn": new js.JsFunction.withThis((_) => callback())
-  }));
-}

modules/benchpress/src/benchpress.es6

@@ -1,55 +0,0 @@
-// TODO: move the functionality of this module into benchpress itself!
-
-var benchmarkNames = [];
-
-function benchmarkId(index) {
-  return 'benchmark' + index;
-}
-
-function useBenchmark(index) {
-  var search = window.location.search;
-  if (search.length > 0) {
-    search = search.substring(1);
-  }
-  if (search.length > 0) {
-    return search == benchmarkId(index);
-  } else {
-    return true;
-  }
-}
-
-function onLoad(callback) {
-  var isReady = document.readyState === 'complete';
-  if (isReady) {
-    window.setTimeout(callback);
-  } else {
-    window.addEventListener('load', callback, false);
-  }
-}
-
-function createBenchmarkMenu() {
-  var div = document.createElement('div');
-  div.innerHTML += '<h1>Benchmarks:</h1><a class="btn btn-default" href="?">All</a>';
-  for (var i=0; i<benchmarkNames.length; i++) {
-    var activeClass = useBenchmark(i) ? 'active' : '';
-    div.innerHTML += ('<a class="btn btn-default '+activeClass+'" href="?'+benchmarkId(i)+'">'+benchmarkNames[i]+'</a>');
-  }
-  document.body.insertBefore(div, document.body.childNodes[0]);
-}
-
-export function benchmark(name, stepsCreationCallback) {
-  benchmarkNames.push(name);
-  if (benchmarkNames.length === 2) {
-    onLoad(createBenchmarkMenu);
-  }
-  if (useBenchmark(benchmarkNames.length-1)) {
-    stepsCreationCallback();
-  }
-}
-
-export function benchmarkStep(name, callback) {
-  var benchmarkName = benchmarkNames[benchmarkNames.length-1];
-  window.benchmarkSteps.push({
-    name: benchmarkName + '#' + name, fn: callback
-  });
-}