Re-included matchers documentation.

utils/apidoc/apidoc.dart

Index: utils/apidoc/apidoc.dart
diff --git a/utils/apidoc/apidoc.dart b/utils/apidoc/apidoc.dart
index 793cd68ab74ed69a7a5c391ce10a89cc718d59b2..785c497b46fe6438e93d9e7dd7a7b360af234185 100644
--- a/utils/apidoc/apidoc.dart
+++ b/utils/apidoc/apidoc.dart
@@ -33,6 +33,8 @@ void main() {
   bool generateAppCache = false;
 
   List<String> excludedLibraries = <String>[];
+  List<String> includedLibraries = <String>[];
+
 
   // Parse the command-line arguments.
   for (int i = 0; i < args.length; i++) {
@@ -54,6 +56,8 @@ void main() {
       default:
         if (arg.startsWith('--exclude-lib=')) {
           excludedLibraries.add(arg.substring('--exclude-lib='.length));
+        } else if (arg.startsWith('--include-lib=')) {
+          includedLibraries.add(arg.substring('--include-lib='.length));
         } else if (arg.startsWith('--out=')) {
           outputDir = new Path.fromNative(arg.substring('--out='.length));
         } else {
@@ -108,8 +112,6 @@ void main() {
     }
   });
 
-  final includedLibraries = <String>[];
-
   var lister = new Directory.fromPath(doc.scriptDir.append('../../pkg')).list();
   lister.onDir = (dirPath) {
     var path = new Path.fromNative(dirPath);