Make v8 recipes explicitly set GIT_MODE

scripts/slave/recipes/v8/auto_roll_v8_deps.py

 
 # Copyright 2014 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.
 
 from recipe_engine.types import freeze
 
 DEPS = [
   'depot_tools/bot_update',
   'depot_tools/gclient',
@@ skipping 61 matching lines @@
 
     deps[key] = value
 
   # Log DEPS output.
   step_result.presentation.logs['deps'] = api.json.dumps(
       deps, indent=2).splitlines()
   return deps
 
 
 def RunSteps(api):
-  api.gclient.set_config('v8')
+  api.gclient.set_config('v8', GIT_MODE=True)
   api.gclient.apply_config('chromium')
 
   # Allow rolling all v8 os deps.
   api.gclient.c.target_os.add('android')
   api.gclient.c.target_os.add('win')
 
   # Skip large repos.
   s = api.gclient.c.solutions[1]
   s.custom_deps.update({
     'src/chrome/test/data/pdf_private': None,
@@ skipping 130 matching lines @@
       ) +
       api.override_step_data(
           'look up another_dep',
           api.raw_io.stream_output('deadbeaf\tHEAD', stream='stdout'),
       ) +
       api.override_step_data(
           'git diff',
           api.raw_io.stream_output('some difference', stream='stdout'),
       )
   )