Add PDBs to .isolate files so that tests show stack traces.

chrome/sync_integration_tests.isolate

 # Copyright 2012 The Chromium 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': [
     ['OS=="linux"', {
       'variables': {
         'command': [
           '../testing/xvfb.py',
           '<(PRODUCT_DIR)',
@@ skipping 52 matching lines @@
           '<(PRODUCT_DIR)/<(mac_product_name).app/',
         ],
       },
     }],
     ['OS=="win"', {
       'variables': {
         'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/chrome_elf.dll',
           '<(PRODUCT_DIR)/ffmpegsumo.dll',
         ],
+        'isolate_dependency_untracked': [
+          '<(PRODUCT_DIR)/sync_integration_tests.exe.pdb',
+        ],
       },
     }],
     ['chromeos==1', {
       'variables': {
         'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/libexif.so',
         ],
       },
     }],
   ],
   'includes': [
     '../third_party/icu/icu.isolate',
   ],
 }