feat(dart/transform): Inline templateUrl values

Modify DirectiveProcessor to inline `templateUrl` values to avoid making
additional browser requests.

Closes #1035

modules/angular2/test/transform/directive_processor/all_tests.dart

@@ -3,10 +3,10 @@ library angular2.test.transform.directive_processor.all_tests;
 import 'package:barback/barback.dart';
 import 'package:angular2/src/transform/directive_processor/rewriter.dart';
 import 'package:angular2/src/transform/common/annotation_matcher.dart';
-import '../common/read_file.dart';
 import 'package:dart_style/dart_style.dart';
 import 'package:guinness/guinness.dart';
 import 'package:path/path.dart' as path;
+import '../common/read_file.dart';
 
 var formatter = new DartFormatter();
 
@@ -36,6 +36,9 @@ void allTests() {
       customDescriptors: [
     const AnnotationDescriptor('Soup', 'package:soup/soup.dart', 'Component'),
   ]);
+
+  _testNgDeps(
+      'should inline `templateUrl` values.', 'url_expression_files/hello.dart');
 }
 
 void _testNgDeps(String name, String inputPath,
@@ -43,11 +46,13 @@ void _testNgDeps(String name, String inputPath,
   it(name, () async {
     var inputId = _assetIdForPath(inputPath);
     var reader = new TestAssetReader();
-    var input = await reader.readAsString(inputId);
+    if (assetId != null) {
+      reader.addAsset(assetId, await reader.readAsString(inputId));
+      inputId = assetId;
+    }
     var annotationMatcher = new AnnotationMatcher()..addAll(customDescriptors);
-    var proxyInputId = assetId != null ? assetId : inputId;
-    var output =
-        formatter.format(createNgDeps(input, proxyInputId, annotationMatcher));
+    var output = formatter
+        .format(await createNgDeps(reader, inputId, annotationMatcher));
     var expectedPath = path.join(path.dirname(inputPath), 'expected',
         path.basename(inputPath).replaceFirst('.dart', '.ng_deps.dart'));
     var expectedId = _assetIdForPath(expectedPath);

modules/angular2/test/transform/directive_processor/url_expression_files/expected/hello.ng_deps.dart

@@ -0,0 +1,20 @@
+library examples.src.hello_world.index_common_dart.ng_deps.dart;
+
+import 'hello.dart';
+import 'package:angular2/angular2.dart'
+    show bootstrap, Component, Directive, View, NgElement;
+
+var _visited = false;
+void initReflector(reflector) {
+  if (_visited) return;
+  _visited = true;
+  reflector
+    ..registerType(HelloCmp, {
+      'factory': () => new HelloCmp(),
+      'parameters': const [],
+      'annotations': const [
+        const Component(selector: 'hello-app'),
+        const View(template: r'''{{greeting}}''')
+      ]
+    });
+}

modules/angular2/test/transform/directive_processor/url_expression_files/hello.dart

@@ -0,0 +1,8 @@
+library examples.src.hello_world.index_common_dart;
+
+import 'package:angular2/angular2.dart'
+    show bootstrap, Component, Directive, View, NgElement;
+
+@Component(selector: 'hello-app')
+@View(templateUrl: 'template.html')
+class HelloCmp {}

modules/angular2/test/transform/directive_processor/url_expression_files/template.html

@@ -0,0 +1 @@
+{{greeting}}