Replace bootstrap logic with 'boot.js', use 'component/dart' mime-type and add

pkg/polymer/lib/src/build/linter.dart

Index: pkg/polymer/lib/src/build/linter.dart
diff --git a/pkg/polymer/lib/src/build/linter.dart b/pkg/polymer/lib/src/build/linter.dart
index 8c7fe96e2dddc381fabca8be347bcddea55ab059..668d969dbcf57b68f8e19ead187f8d0653380f24 100644
--- a/pkg/polymer/lib/src/build/linter.dart
+++ b/pkg/polymer/lib/src/build/linter.dart
@@ -140,6 +140,7 @@ class _LinterVisitor extends TreeVisitor {
   TransformLogger _logger;
   bool _inPolymerElement = false;
   bool _dartTagSeen = false;
+  bool _polymerHtmlSeen = false;
   bool _isEntrypoint;
   Map<String, _ElementSummary> _elements;
 
@@ -169,8 +170,8 @@ class _LinterVisitor extends TreeVisitor {
   void run(Document doc) {
     visit(doc);
 
-    if (_isEntrypoint && !_dartTagSeen) {
-      _logger.error(USE_INIT_DART, span: doc.body.sourceSpan);
+    if (_isEntrypoint && !_polymerHtmlSeen) {
+      _logger.warning(USE_POLYMER_HTML, span: doc.body.sourceSpan);
     }
   }
 
@@ -186,10 +187,15 @@ class _LinterVisitor extends TreeVisitor {
     }
 
     var href = node.attributes['href'];
-    if (href != null && href != '') return;
+    if (href == null || href == '') {
+      _logger.warning('link rel="$rel" missing href.', span: node.sourceSpan);
+      return;
+    }
 
+    if (href == 'packages/polymer/polymer.html') {
+      _polymerHtmlSeen = true;
+    }
     // TODO(sigmund): warn also if href can't be resolved.
-    _logger.warning('link rel="$rel" missing href.', span: node.sourceSpan);
   }
 
   /// Produce warnings if using `<element>` instead of `<polymer-element>`.
@@ -245,34 +251,20 @@ class _LinterVisitor extends TreeVisitor {
 
   /// Checks for multiple Dart script tags in the same page, which is invalid.
   void _validateScriptElement(Element node) {
-    var scriptType = node.attributes['type'];
-    var isDart = scriptType == 'application/dart';
     var src = node.attributes['src'];
-
-    if (isDart) {
-      if (_dartTagSeen) {
-        _logger.warning('Only one "application/dart" script tag per document '
-            'is allowed.', span: node.sourceSpan);
-      }
-      _dartTagSeen = true;
-    }
-
     if (src == null) return;
-
-    if (src == 'packages/polymer/boot.js') {
-      _logger.warning(BOOT_JS_DEPRECATED, span: node.sourceSpan);
-      return;
-    }
+    var type = node.attributes['type'];
+    bool isDart = type == 'application/dart;component=1' ||
+        type == 'application/dart';
 
     if (src.endsWith('.dart') && !isDart) {
-      _logger.warning('Wrong script type, expected type="application/dart".',
-          span: node.sourceSpan);
+      _logger.warning('Wrong script type, expected type="application/dart" '
+          'or type="application/dart;component=1".', span: node.sourceSpan);
       return;
     }
 
     if (!src.endsWith('.dart') && isDart) {
-      _logger.warning('"application/dart" scripts should '
-          'use the .dart file extension.',
+      _logger.warning('"$type" scripts should use the .dart file extension.',
           span: node.sourceSpan);
       return;
     }
@@ -385,18 +377,10 @@ class _LinterVisitor extends TreeVisitor {
   }
 }
 
-const String USE_INIT_DART =
-    'To run a polymer application, you need to call "initPolymer". You can '
-    'either include a generic script tag that does this for you:'
-    '\'<script type="application/dart">export "package:polymer/init.dart";'
-    '</script>\' or add your own script tag and call that function. '
-    'Make sure the script tag is placed after all HTML imports.';
-
-const String BOOT_JS_DEPRECATED =
-    '"boot.js" is now deprecated. Instead, you can initialize your polymer '
-    'application by calling "initPolymer()" in your main. If you don\'t have a '
-    'main, then you can include our generic main by adding the following '
-    'script tag to your page: \'<script type="application/dart">export '
-    '"package:polymer/init.dart";</script>\'. Additionally you need to '
-    'include: \'<script src="packages/browser/dart.js"></script>\' in the page '
-    'too. Make sure these script tags come after all HTML imports.';
+const String USE_POLYMER_HTML =
+    'To run a polymer application you need to include the following HTML '
+    'import: <link rel="import" href="packages/polymer/polymer.html">. This '
+    'will include the common polymer logic needed to boostrap your '
+    'application. The old style of initializing polymer with boot.js or '
+    'initPolymer are now deprecated. ';
+