Store library paths relative to a given application root folder.

pkg/kernel/test/baseline_tester.dart

Index: pkg/kernel/test/baseline_tester.dart
diff --git a/pkg/kernel/test/baseline_tester.dart b/pkg/kernel/test/baseline_tester.dart
index c2c47e584d58befdd8d80824f04ab120ca55ade8..b954e20197a40f31e39d252b4a42b04a599d87b6 100644
--- a/pkg/kernel/test/baseline_tester.dart
+++ b/pkg/kernel/test/baseline_tester.dart
@@ -4,6 +4,7 @@
 import 'dart:io';
 
 import 'package:kernel/analyzer/loader.dart';
+import 'package:kernel/application_root.dart';
 import 'package:kernel/kernel.dart';
 import 'package:kernel/target/targets.dart';
 import 'package:kernel/text/ast_to_text.dart';
@@ -30,11 +31,13 @@ void runBaselineTests(String folderName, TestTarget target) {
   String outputDirectory = '$testcaseDirectory/$folderName';
   var batch = new DartLoaderBatch();
   Directory directory = new Directory(inputDirectory);
+  var applicationRoot = new ApplicationRoot(directory.absolute.path);
   for (FileSystemEntity file in directory.listSync()) {
     if (file is File && file.path.endsWith('.dart')) {
       String name = pathlib.basename(file.path);
       test(name, () async {
-        String dartPath = file.path;
+        Uri dartPath =
+            new Uri(scheme: 'file', path: pathlib.absolute(file.path));
         String shortName = pathlib.withoutExtension(name);
         String filenameOfBaseline = '$outputDirectory/$shortName.baseline.txt';
         String filenameOfCurrent = '$outputDirectory/$shortName.current.txt';
@@ -45,7 +48,8 @@ void runBaselineTests(String folderName, TestTarget target) {
             new DartOptions(
                 strongMode: target.strongMode,
                 sdk: sdkDirectory,
-                declaredVariables: target.extraDeclaredVariables));
+                declaredVariables: target.extraDeclaredVariables,
+                applicationRoot: applicationRoot));
         var program = loader.loadProgram(dartPath, target: target);
         verifyProgram(program);
         var errors = target.transformProgram(program);