Set up a variable so that the compiler script can be imported using an import map.

vm/unit_test.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_UNIT_TEST_H_
 #define VM_UNIT_TEST_H_
 
 #include "include/dart_api.h"
 
 #include "vm/ast.h"
@@ skipping 147 matching lines @@
 };
 
 
 class TestCase : TestCaseBase {
  public:
   typedef void (RunEntry)();
 
   TestCase(RunEntry* run, const char* name) : TestCaseBase(name), run_(run) { }
 
   static Dart_Handle LoadTestScript(const char* script,
-                                    Dart_NativeEntryResolver resolver);
+                                    Dart_NativeEntryResolver resolver) {
+    return LoadTestScript(script, resolver, Dart_NewList(0));
+  }
+  static Dart_Handle LoadTestScript(const char* script,
+                                    Dart_NativeEntryResolver resolver,
+                                    Dart_Handle import_map);
   static Dart_Handle lib();
   static const char* url() { return "dart:test-lib"; }
   static Dart_Isolate CreateTestIsolateFromSnapshot(uint8_t* buffer) {
     return CreateIsolate(buffer);
   }
   static Dart_Isolate CreateTestIsolate() {
     return CreateIsolate(NULL);
   }
   static Dart_Handle library_handler(Dart_LibraryTag tag,
                                      Dart_Handle library,
@@ skipping 119 matching lines @@
     } else {                                                                   \
       dart::Expect(__FILE__, __LINE__).Fail(                                   \
           "expected '%s' to be an error handle but found a valid handle.\n",   \
           #handle);                                                            \
     }                                                                          \
   } while (0)
 
 }  // namespace dart
 
 #endif  // VM_UNIT_TEST_H_