Add a polymer validator: a linter/analysis that will replace the old

pkg/polymer/lib/src/transform/import_inliner.dart

Index: pkg/polymer/lib/src/transform/import_inliner.dart
diff --git a/pkg/polymer/lib/src/transform/import_inliner.dart b/pkg/polymer/lib/src/transform/import_inliner.dart
index 081c2ce3ab61f0590bedd607d568a032ed2712b6..66bd029f1468bfe3e819f53070af78ce5c2a3a50 100644
--- a/pkg/polymer/lib/src/transform/import_inliner.dart
+++ b/pkg/polymer/lib/src/transform/import_inliner.dart
@@ -18,20 +18,19 @@ import 'common.dart';
 // than polymer-element (see dartbug.com/12613).
 class ImportedElementInliner extends Transformer {
   /** Only run on entrypoint .html files under web or test. */
-  Future<bool> isPrimary(Asset input) => isHtmlInWebOrTest(input.id);
+  Future<bool> isPrimary(Asset input) =>
+      new Future.value(isHtmlInWebOrTest(input.id));
 
   Future apply(Transform transform) {
     var seen = new Set<AssetId>();
     var elements = [];
     var id = transform.primaryInput.id;
     seen.add(id);
-    return transform.primaryInput.readAsString().then((content) {
-      var document = parseHtml(content, id.path, transform.logger,
-        checkDocType: true);
+    return readPrimaryAsHtml(transform).then((document) {
       var future = _visitImports(document, id, transform, seen, elements);
       return future.then((importsFound) {
         if (!importsFound) {
-          transform.addOutput(new Asset.fromString(id, content));
+          transform.addOutput(transform.primaryInput);
           return;
         }
 
@@ -83,8 +82,7 @@ class ImportedElementInliner extends Transformer {
    */
   Future _collectPolymerElements(AssetId id, Transform transform,
       Set<AssetId> seen, List elements) {
-    return transform.readInputAsString(id).then((content) {
-      var document = parseHtml(content, id.path, transform.logger);
+    return readAsHtml(id, transform).then((document) {
       return _visitImports(document, id, transform, seen, elements).then((_) {
         var normalizer = new _UrlNormalizer(transform, id);
         for (var element in document.queryAll('polymer-element')) {