Generate common types into a separate library

pkg/analyzer_plugin/tool/spec/codegen_inttest_methods.dart

Index: pkg/analyzer_plugin/tool/spec/codegen_inttest_methods.dart
diff --git a/pkg/analyzer_plugin/tool/spec/codegen_inttest_methods.dart b/pkg/analyzer_plugin/tool/spec/codegen_inttest_methods.dart
index 2da079c677f5920da3f775517a0d2491d7d5fc73..ddc730fbb5765e505d09294635805daa0698871a 100644
--- a/pkg/analyzer_plugin/tool/spec/codegen_inttest_methods.dart
+++ b/pkg/analyzer_plugin/tool/spec/codegen_inttest_methods.dart
@@ -111,6 +111,11 @@ class CodegenInttestMethodsVisitor extends DartCodegenVisitor
     writeln();
     writeln("import 'integration_tests.dart';");
     writeln("import 'protocol_matchers.dart';");
+    for (String uri in api.types.importUris) {
+      write("import '");
+      write(uri);
+      writeln("';");
+    }
     writeln();
     writeln('/**');
     writeln(' * Convenience methods for running integration tests');