support --options flag and other analysis options flags in DDC

pkg/dev_compiler/lib/src/compiler/command.dart

Index: pkg/dev_compiler/lib/src/compiler/command.dart
diff --git a/pkg/dev_compiler/lib/src/compiler/command.dart b/pkg/dev_compiler/lib/src/compiler/command.dart
index 102f33a6610717e809131d6372c6311585e19f5e..58f6d707b7ec893a6405fca6f8bcb1deefe083b1 100644
--- a/pkg/dev_compiler/lib/src/compiler/command.dart
+++ b/pkg/dev_compiler/lib/src/compiler/command.dart
@@ -32,7 +32,7 @@ int compile(List<String> args, {void printFn(Object obj)}) {
   ArgResults argResults;
   AnalyzerOptions analyzerOptions;
   try {
-    var parser = _argParser();
+    var parser = ddcArgParser();
     if (args.contains('--$ignoreUnrecognizedFlagsFlag')) {
       args = filterUnknownArguments(args, parser);
     }
@@ -83,7 +83,7 @@ $stackTrace
   }
 }
 
-ArgParser _argParser({bool hide: true}) {
+ArgParser ddcArgParser({bool hide: true}) {
   var argParser = new ArgParser(allowTrailingOptions: true)
     ..addFlag('help',
         abbr: 'h',
@@ -121,7 +121,14 @@ bool _changed(List<int> list1, List<int> list2) {
 
 void _compile(ArgResults argResults, AnalyzerOptions analyzerOptions,
     void printFn(Object obj)) {
-  var compiler = new ModuleCompiler(analyzerOptions);
+  var libraryRoot = argResults['library-root'] as String;
+  if (libraryRoot != null) {
+    libraryRoot = path.absolute(libraryRoot);
+  } else {
+    libraryRoot = Directory.current.path;
+  }
+
+  var compiler = new ModuleCompiler(libraryRoot, analyzerOptions);
   var compilerOpts = new CompilerOptions.fromArguments(argResults);
   var outPaths = argResults['out'] as List<String>;
   var moduleFormats = parseModuleFormatOption(argResults);
@@ -147,12 +154,6 @@ void _compile(ArgResults argResults, AnalyzerOptions analyzerOptions,
   // we've removed the "root" and "module name" variables.
   var firstOutPath = outPaths[0];
 
-  var libraryRoot = argResults['library-root'] as String;
-  if (libraryRoot != null) {
-    libraryRoot = path.absolute(libraryRoot);
-  } else {
-    libraryRoot = Directory.current.path;
-  }
   var moduleRoot = argResults['module-root'] as String;
   String modulePath;
   if (moduleRoot != null) {
@@ -225,7 +226,7 @@ String _moduleForLibrary(
 
 String get _usageMessage =>
     'Dart Development Compiler compiles Dart into a JavaScript module.'
-    '\n\n${_argParser(hide: !_verbose).usage}';
+    '\n\n${ddcArgParser(hide: !_verbose).usage}';
 
 void _usageException(String message) {
   throw new UsageException(message, _usageMessage);