Refactor Parsing to remove compiler dependency

tests/compiler/dart2js/exit_code_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Test the exit code of dart2js in case of exceptions, errors, warnings, etc.
 
 
 import 'dart:async';
 import 'dart:io' show Platform;
 
@@ skipping 19 matching lines @@
 import 'package:compiler/src/options.dart' show CompilerOptions;
 import 'package:compiler/src/resolution/resolution.dart';
 import 'package:compiler/src/scanner/scanner_task.dart';
 import 'package:compiler/src/universe/world_impact.dart';
 import 'diagnostic_reporter_helper.dart';
 
 class TestCompiler extends apiimpl.CompilerImpl {
   final String testMarker;
   final String testType;
   final Function onTest;
-  DiagnosticReporter reporter;
+  TestDiagnosticReporter reporter;
 
   TestCompiler(api.CompilerInput inputProvider,
                api.CompilerOutput outputProvider,
                api.CompilerDiagnostics handler,
                Uri libraryRoot,
                Uri packageRoot,
                List<String> options,
                Map<String, dynamic> environment,
                Uri packageConfig,
                api.PackagesDiscoveryProvider findPackages,
                String this.testMarker,
                String this.testType,
                Function this.onTest)
-      : super(inputProvider, outputProvider, handler,
+      : reporter = new TestDiagnosticReporter(),
+        super(inputProvider, outputProvider, handler,
             new CompilerOptions.parse(
                 libraryRoot: libraryRoot,
                 packageRoot: packageRoot,
                 options: options,
                 environment: environment,
                 packageConfig: packageConfig,
                 packagesDiscoveryProvider: findPackages)) {
-    reporter = new TestDiagnosticReporter(this, super.reporter);
+    reporter.compiler = this;
+    reporter.reporter = super.reporter;
     test('Compiler');
   }
 
   @override
   ScannerTask createScannerTask() => new TestScanner(this);
 
   @override
   ResolverTask createResolverTask() {
     return new TestResolver(this, backend.constantCompilerTask);
   }
@@ skipping 56 matching lines @@
         break;
       case '':
         onTest(testMarker, testType);
         break;
       }
     }
   }
 }
 
 class TestDiagnosticReporter extends DiagnosticReporterWrapper {
-  final TestCompiler compiler;
-  final DiagnosticReporter reporter;
-
-  TestDiagnosticReporter(this.compiler, this.reporter);
+  TestCompiler compiler;
+  DiagnosticReporter reporter;
 
   @override
   withCurrentElement(Element element, f()) {
     return super.withCurrentElement(element, () {
       compiler.test('Compiler.withCurrentElement');
       return f();
     });
   }
 }
 
@@ skipping 153 matching lines @@
 
       expected = _expectedExitCode(
           beforeRun: tests[marker], fatalWarnings: true);
       totalExpectedErrors += expected.length;
       await testExitCodes(marker, expected, ['--fatal-warnings']);
     }
 
     Expect.equals(totalExpectedErrors, checkedResults);
   });
 }