First half of the new HTML json docs.

utils/apidoc/lib/metadata.dart

Index: utils/apidoc/lib/metadata.dart
diff --git a/utils/apidoc/lib/metadata.dart b/utils/apidoc/lib/metadata.dart
new file mode 100644
index 0000000000000000000000000000000000000000..e042d004423ca9ba8ff40081d6abb0e6b899b70d
--- /dev/null
+++ b/utils/apidoc/lib/metadata.dart
@@ -0,0 +1,14 @@
+library metadata;
+
+import '../../../sdk/lib/_internal/compiler/implementation/mirrors/mirrors.dart';
+
+/// Returns the metadata for the given string or null if not found.
+InstanceMirror findMetadata(List<InstanceMirror> metadataList, String find) {
+  return metadataList.firstMatching(
+      (metadata) {
+        if (metadata is TypeInstanceMirror) {
+          return metadata.representedType.simpleName == find;
+        }
+        return metadata.type.simpleName == find;
+      }, orElse: () => null);
+}