Refactor analysis server code generation to re-use logic from analyzer.

pkg/analysis_server/tool/spec/codegen_matchers.dart

Index: pkg/analysis_server/tool/spec/codegen_matchers.dart
diff --git a/pkg/analysis_server/tool/spec/codegen_matchers.dart b/pkg/analysis_server/tool/spec/codegen_matchers.dart
index 5786493a63f3fcc1c9e1f65699ed93f306f5b882..be2f847e398d60cf8799bab47f3047a16cdc2244 100644
--- a/pkg/analysis_server/tool/spec/codegen_matchers.dart
+++ b/pkg/analysis_server/tool/spec/codegen_matchers.dart
@@ -9,25 +9,19 @@ library codegen.matchers;
 
 import 'dart:convert';
 
+import 'package:analyzer/src/codegen/tools.dart';
+
 import 'api.dart';
-import 'codegen_tools.dart';
 import 'from_html.dart';
 import 'implied_types.dart';
 import 'to_html.dart';
 
-final GeneratedFile target =
-    new GeneratedFile('../../test/integration/protocol_matchers.dart', () {
-  CodegenMatchersVisitor visitor = new CodegenMatchersVisitor(readApi());
+final GeneratedFile target = new GeneratedFile(
+    'test/integration/protocol_matchers.dart', (String pkgPath) {
+  CodegenMatchersVisitor visitor = new CodegenMatchersVisitor(readApi(pkgPath));
   return visitor.collectCode(visitor.visitApi);
 });
 
-/**
- * Translate spec_input.html into protocol_matchers.dart.
- */
-main() {
-  target.generate();
-}
-
 class CodegenMatchersVisitor extends HierarchicalApiVisitor with CodeGenerator {
   /**
    * Visitor used to produce doc comments.