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

protractor-perf-shared.js

@@ -0,0 +1,50 @@
+var config = exports.config = {
+
+  specs: ['modules/*/test/**/*_perf.js'],
+
+  params: {
+    // number test iterations to warm up the browser
+    warmupCount: 10,
+    // number test iterations to measure
+    measureCount: 10,
+    // TODO(tbosch): remove this and provide a proper protractor integration
+    sleepInterval: process.env.TRAVIS ? 5000 : 1000,
+  },
+
+  // Disable waiting for Angular as we don't have an integration layer yet...
+  // TODO(tbosch): Implement a proper debugging API for Ng2.0, remove this here
+  // and the sleeps in all tests.
+  onPrepare: function() {
+    browser.ignoreSynchronization = true;
+  },
+
+  jasmineNodeOpts: {
+    showColors: true,
+    defaultTimeoutInterval: 30000
+  }
+};
+
+// TODO: add real mobile devices via a cloud provider that supports appium
+if (process.env.TRAVIS) {
+  config.capabilities = {
+    name: 'Dartium',
+    browserName: 'chrome',
+    chromeOptions: {
+      'binary': process.env.DARTIUM,
+      'args': ['--js-flags=--expose-gc']
+    },
+    loggingPrefs: {
+      performance: 'ALL'
+    }
+  };
+} else {
+  config.capabilities = {
+    browserName: 'chrome',
+    chromeOptions: {
+      'args': ['--js-flags=--expose-gc']
+    },
+    loggingPrefs: {
+      performance: 'ALL'
+    }
+  };
+}