Refactor LibraryUpdater to prepare for parts.

dart/tests/try/poi/apply_updates_test.dart

Index: dart/tests/try/poi/apply_updates_test.dart
diff --git a/dart/tests/try/poi/apply_updates_test.dart b/dart/tests/try/poi/apply_updates_test.dart
index 8d7943592a69f474b1908c9f861c1fd6e2d8d073..303bdddcb942b4ccf5274863ee4f7c0ae933ba85 100644
--- a/dart/tests/try/poi/apply_updates_test.dart
+++ b/dart/tests/try/poi/apply_updates_test.dart
@@ -10,6 +10,7 @@ import 'dart:convert' show
     UTF8;
 
 import 'package:dart2js_incremental/library_updater.dart' show
+    IncrementalCompilerContext,
     LibraryUpdater,
     Update;
 
@@ -37,8 +38,11 @@ class ApplyUpdateTestCase extends LibraryUpdaterTestCase {
     PartialFunctionElement before = library.localLookup(expectedUpdate);
     var beforeNode = before.parseNode(compiler);
 
+    var context = new IncrementalCompilerContext();
     LibraryUpdater updater =
-        new LibraryUpdater(this.compiler, null, scriptUri, nolog, nolog);
+        new LibraryUpdater(this.compiler, null, nolog, nolog, context);
+    context.registerUriWithUpdates([scriptUri]);
+
     bool actualCanReuse =
         updater.canReuseLibrary(library, UTF8.encode(newSource));
     Expect.equals(expectedCanReuse, actualCanReuse);