fix(build): simplify the e2e/perf config via command line arguments

protractor-dart2js.conf.js

@@ -0,0 +1,13 @@
+var data = module.exports = require('./protractor-shared.js');
+var config = data.config;
+
+config.baseUrl = 'http://localhost:8002/';
+
+config.exclude.push(
+  'dist/js/cjs/examples/e2e_test/sourcemap/sourcemap_spec.js',
+  // TODO: remove this line when largetable dart has been added
+  'dist/js/cjs/benchmarks_external/e2e_test/largetable_perf.js'
+);
+
+data.createBenchpressRunner({ lang: 'dart' });
+