Introduces `ParserOptions`.

pkg/compiler/lib/src/compiler.dart

Index: pkg/compiler/lib/src/compiler.dart
diff --git a/pkg/compiler/lib/src/compiler.dart b/pkg/compiler/lib/src/compiler.dart
index 79ff968a7c1d4ee9ae130a7f73cbc0891db84664..aa7966667f84784e009c1b5e75f718a18231e210 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -93,6 +93,8 @@ import 'parser/diet_parser_task.dart' show
     DietParserTask;
 import 'parser/element_listener.dart' show
     ScannerOptions;
+import 'parser/parser.dart' show
+    ParserOptions;
 import 'parser/parser_task.dart' show
     ParserTask;
 import 'patch_parser.dart' show
@@ -203,6 +205,9 @@ abstract class Compiler {
   final bool enableExperimentalMirrors;
   final bool enableAssertMessage;
 
+  /// Bundle all parser related options.
+  final ParserOptions _parserOptions;
+
   /**
    * The maximum size of a concrete type before it widens to dynamic during
    * concrete type inference.
@@ -475,7 +480,9 @@ abstract class Compiler {
         this.hasIncrementalSupport = hasIncrementalSupport,
         cacheStrategy = new CacheStrategy(hasIncrementalSupport),
         this.userOutputProvider = outputProvider == null
-            ? const NullCompilerOutput() : outputProvider {
+            ? const NullCompilerOutput() : outputProvider,
+        this._parserOptions = new ParserOptions(
+            enableConditionalDirectives: enableConditionalDirectives) {
     if (hasIncrementalSupport) {
       // TODO(ahe): This is too much. Any method from platform and package
       // libraries can be inlined.
@@ -485,7 +492,7 @@ abstract class Compiler {
     // TODO(johnniwinther): Initialize core types in [initializeCoreClasses] and
     // make its field final.
     _reporter = new _CompilerDiagnosticReporter(this, diagnosticOptions);
-    _parsing = new _CompilerParsing(this);
+    _parsing = new _CompilerParsing(this, _parserOptions);
     _resolution = new _CompilerResolution(this);
     _coreTypes = new _CompilerCoreTypes(_resolution);
     types = new Types(_resolution);
@@ -518,12 +525,9 @@ abstract class Compiler {
       libraryLoader = new LibraryLoaderTask(this),
       serialization = new SerializationTask(this),
       scanner = new ScannerTask(this),
-      dietParser = new DietParserTask(
-          this, enableConditionalDirectives: enableConditionalDirectives),
-      parser = new ParserTask(
-          this, enableConditionalDirectives: enableConditionalDirectives),
-      patchParser = new PatchParserTask(
-          this, enableConditionalDirectives: enableConditionalDirectives),
+      dietParser = new DietParserTask(this, _parserOptions),
+      parser = new ParserTask(this, _parserOptions),
+      patchParser = new PatchParserTask(this, _parserOptions),
       resolver = new ResolverTask(this, backend.constantCompilerTask),
       closureToClassMapper = new closureMapping.ClosureTask(this),
       checker = new TypeCheckerTask(this),
@@ -2163,8 +2167,9 @@ class _CompilerResolution implements Resolution {
 // and [ScannerTask] here.
 class _CompilerParsing implements Parsing {
   final Compiler compiler;
+  final ParserOptions parserOptions;
 
-  _CompilerParsing(this.compiler);
+  _CompilerParsing(this.compiler, this.parserOptions);
 
   @override
   DiagnosticReporter get reporter => compiler.reporter;