[debugger] basic test infrastructure for new debugger test api.

test/debugger/debugger.gyp

 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'conditions': [
     ['test_isolation_mode != "noop"', {
       'targets': [
         {
-          'target_name': 'jsfunfuzz_run',
+          'target_name': 'debugger_run',
           'type': 'none',
           'dependencies': [
             '../../src/d8.gyp:d8_run',
           ],
           'includes': [
             '../../gypfiles/features.gypi',
             '../../gypfiles/isolate.gypi',
           ],
           'sources': [
-            'jsfunfuzz.isolate',
+            'debugger.isolate',
           ],
         },
       ],
     }],
   ],
 }