dart2js: fix tests after moving to .packages in the SDK repo

pkg/dart2js_incremental/lib/dart2js_incremental.dart

Index: pkg/dart2js_incremental/lib/dart2js_incremental.dart
diff --git a/pkg/dart2js_incremental/lib/dart2js_incremental.dart b/pkg/dart2js_incremental/lib/dart2js_incremental.dart
index 86ef905518db83b9cf2b40c1a9577103c8063c73..e62c7c31d92361ef734b1a5b7f2c7d588ef7852d 100644
--- a/pkg/dart2js_incremental/lib/dart2js_incremental.dart
+++ b/pkg/dart2js_incremental/lib/dart2js_incremental.dart
@@ -54,6 +54,7 @@ const List<String> INCREMENTAL_OPTIONS = const <String>[
 class IncrementalCompiler {
   final Uri libraryRoot;
   final Uri packageRoot;
+  final Uri packageConfig;
   final CompilerInput inputProvider;
   final CompilerDiagnostics diagnosticHandler;
   final List<String> options;
@@ -67,6 +68,7 @@ class IncrementalCompiler {
   IncrementalCompiler({
       this.libraryRoot,
       this.packageRoot,
+      this.packageConfig,
       this.inputProvider,
       this.diagnosticHandler,
       this.options,
@@ -107,6 +109,7 @@ class IncrementalCompiler {
         cachedCompiler: _compiler,
         libraryRoot: libraryRoot,
         packageRoot: packageRoot,
+        packageConfig: packageConfig,
         inputProvider: inputProvider,
         diagnosticHandler: diagnosticHandler,
         options: options,