Adding Angular and dependent packages for testing

third_party/pkg/angular/karma-parser-generator/preprocessor.js

+var fs = require('fs');
+var sys = require('sys');
+var exec = require('child_process').exec;
+
+var generateParser = function(logger) {
+  var log = logger.create('generate-parser');
+  return function(content, file, done) {
+    log.info('Generating parser for parser test: %s', file.originalPath);
+
+    fs.readFile(file.originalPath, function(err, data) {
+      if (err) throw err;
+
+      exec('dart --checked bin/parser_generator_for_spec.dart', function(err, stdout, stderr) {
+        if (err) throw err;
+        data = data.toString();
+        data = data.replace(/^.* \/\/ REMOVE$/m, '');
+        data = data.replace(/_template;/, '_generated;');
+        done(data + '\n\n' + stdout);
+      });
+    });
+  }
+}
+
+module.exports = generateParser;