Fixes #179 -- compile error if editing files during server mode

lib/src/codegen/code_generator.dart

Index: lib/src/codegen/code_generator.dart
diff --git a/lib/src/codegen/code_generator.dart b/lib/src/codegen/code_generator.dart
index ee16c93d75a1a2a3036cc6fdf8a0d71699d6ad54..9ecefaf416ae5dbcd135aa3aacbbf618235363eb 100644
--- a/lib/src/codegen/code_generator.dart
+++ b/lib/src/codegen/code_generator.dart
@@ -9,16 +9,35 @@ import 'dart:io';
 import 'package:analyzer/src/generated/ast.dart' show CompilationUnit;
 import 'package:analyzer/src/generated/element.dart'
     show CompilationUnitElement, LibraryElement;
+import 'package:analyzer/src/generated/engine.dart' show AnalysisContext;
 import 'package:path/path.dart' as path;
 
+import 'package:dev_compiler/devc.dart' show CompilerContext;
 import 'package:dev_compiler/src/info.dart';
 import 'package:dev_compiler/src/utils.dart' show canonicalLibraryName;
 import 'package:dev_compiler/src/checker/rules.dart';
+import 'package:dev_compiler/src/options.dart';
 
 abstract class CodeGenerator {
+  final CompilerContext compiler;
   final String outDir;
   final Uri root;
   final TypeRules rules;
+  final AnalysisContext context;
+  final CompilerOptions options;
+
+  CodeGenerator(CompilerContext compiler)
+      : compiler = compiler,
+        outDir = path.absolute(compiler.options.outputDir),
+        root = compiler.entryPointUri,
+        rules = compiler.rules,
+        context = compiler.context,
+        options = compiler.options;
+
+  /// Return a hash, if any, that can be used for caching purposes. When two
+  /// invocations to this function return the same hash, the underlying
+  /// code-generator generated the same code.
+  String generateLibrary(LibraryUnit unit, LibraryInfo info);
 
   static List<String> _searchPaths = () {
     // TODO(vsm): Can we remove redundancy with multi_package_resolver logic?
@@ -124,12 +143,4 @@ abstract class CodeGenerator {
     return new Uri(
         scheme: 'package', path: path.joinAll(parts.sublist(index + 1)));
   }
-
-  CodeGenerator(String outDir, this.root, this.rules)
-      : outDir = path.absolute(outDir);
-
-  /// Return a hash, if any, that can be used for caching purposes. When two
-  /// invocations to this function return the same hash, the underlying
-  /// code-generator generated the same code.
-  String generateLibrary(LibraryUnit unit, LibraryInfo info);
 }