Beginning support for library prefixes in the dart API.

runtime/vm/snapshot_test.cc

Index: runtime/vm/snapshot_test.cc
diff --git a/runtime/vm/snapshot_test.cc b/runtime/vm/snapshot_test.cc
index 01d60e7678875c87a342740c7a9e3a9efec25624..5dacdecf5fb9669f65e9e8e377b39f441f860a16 100644
--- a/runtime/vm/snapshot_test.cc
+++ b/runtime/vm/snapshot_test.cc
@@ -969,7 +969,9 @@ UNIT_TEST_CASE(ScriptSnapshot) {
     // Create a test library and Load up a test script in it.
     TestCase::LoadTestScript(kScriptChars, NULL);
 
-    EXPECT_VALID(Dart_LibraryImportLibrary(TestCase::lib(), import_lib));
+    EXPECT_VALID(Dart_LibraryImportLibrary(TestCase::lib(),
+                                           import_lib,
+                                           Dart_Null()));
 
     // Get list of library URLs loaded and save the count.
     Dart_Handle libs = Dart_GetLibraryURLs();