chore(ddc): make DDC build non-experimental

scripts/ci/dart_ddc/pubspec_for_ddc.js

@@ -0,0 +1,25 @@
+// Removes dart2js from pubspec.yaml for faster building
+// Usage: node pubspec_for_ddc.js --pubspec-file=PATH_TO_PUBSPEC_YAML
+
+var fs = require('fs');
+var yaml = require('js-yaml');
+var yargs = require('yargs');
+
+var pubspecFileOpt = 'pubspec-file';
+var pubspecFile = yargs
+    .demand([pubspecFileOpt])
+    .argv[pubspecFileOpt];
+
+var doc = yaml.safeLoad(fs.readFileSync(pubspecFile, 'utf8'));
+
+var transformers = doc['transformers'];
+if (transformers) {
+  transformers.forEach(function (transformer) {
+    var dart2js = transformer['\$dart2js'];
+    if (dart2js) {
+      dart2js['$exclude'] = [ 'web/**/*' ];
+    }
+  });
+}
+
+fs.writeFileSync(pubspecFile, yaml.safeDump(doc));