Adding Angular and dependent packages for testing

third_party/pkg/angular/lib/tools/common.dart

+library angular.tools.common;
+
+class DirectiveInfo {
+  String selector;
+  String template;
+  List<String> expressionAttrs = <String>[];
+  List<String> expressions = <String>[];
+  DirectiveInfo([this.selector, this.expressionAttrs, this.expressions]) {
+    if (expressionAttrs == null) {
+      expressionAttrs = <String>[];
+    }
+    if (expressions == null) {
+      expressions = <String>[];
+    }
+  }
+}
+
+const String DIRECTIVE = 'DIRECTIVE';
+const String COMPONENT = 'COMPONENT';
+
+class DirectiveMetadata {
+  String className;
+  String type; // DIRECTIVE/COMPONENT
+  String selector;
+  String template;
+  Map<String, String> attributeMappings;
+  List<String> exportExpressionAttrs;
+  List<String> exportExpressions;
+
+  DirectiveMetadata([this.className, this.type, this.selector,
+                     this.attributeMappings, this.exportExpressionAttrs,
+                     this.exportExpressions]) {
+    if (attributeMappings == null) {
+      attributeMappings = <String, String>{};
+    }
+    if (exportExpressions == null) {
+      exportExpressions = <String>[];
+    }
+    if (exportExpressionAttrs == null) {
+      exportExpressionAttrs = <String>[];
+    }
+  }
+}
+