Make android recipes explicitly set GIT_MODE

scripts/slave/recipes/android/perf.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 = [
     'adb',
     'chromium',
@@ skipping 113 matching lines @@
   kwargs = {
     'REPO_NAME':'src',
     'REPO_URL':REPO_URL,
     'INTERNAL':False,
     'BUILD_CONFIG':'Release',
     'TARGET_PLATFORM':'android',
   }
 
   api.chromium_android.set_config(builder_config, **kwargs)
   api.chromium.set_config(builder_config, **kwargs)
-  api.gclient.set_config('perf')
+  api.gclient.set_config('perf', GIT_MODE=True)
   api.gclient.apply_config('android')
 
   bot_update_step = api.bot_update.ensure_checkout()
 
   test_spec_file = builder.get('test_spec_file')
   test_spec = {}
   if test_spec_file:
     test_spec = api.chromium_tests.read_test_spec(api, test_spec_file)
 
     scripts_compile_targets = \
@@ skipping 201 matching lines @@
                        "adb_status": "device",
                        "imei_slice": "",
                        "ro.build.product": "bullhead",
                        "ro.build.id": "MDB08Q",
                        "serial": "00d0d567893340f4",
                        "wifi_ip": ""
                     }]
                 }}),
           retcode=87))