Default gclient's GIT_MODE to True

recipe_modules/gclient/example.expected/tryserver.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "config",
       "--spec",
       "cache_dir = '[ROOT]/git_cache'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]"
     ],
@@ skipping 69 matching lines @@
     },
     "name": "gclient recurse (git config user.email)"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "config",
       "--spec",
-      "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': 'DEPS', 'managed': True, 'name': 'WebKit', 'safesync_url': 'https://blink-status.appspot.com/lkgr', 'url': 'svn://svn.chromium.org/blink/trunk'}]"
+      "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'WebKit', 'safesync_url': 'https://blink-status.appspot.com/lkgr', 'url': 'svn://svn.chromium.org/blink/trunk'}]"
     ],
     "cwd": "[SLAVE_BUILD]/src/third_party",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "[spec: WebKit] gclient setup"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[BUILD]/scripts/slave/gclient_safe_revert.py",
-      ".",
-      "[DEPOT_TOOLS]/gclient"
-    ],
-    "cwd": "[SLAVE_BUILD]/src/third_party",
-    "name": "[spec: WebKit] gclient revert"
-  },
-  {
-    "cmd": [
-      "python",
-      "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "sync",
+      "--verbose",
+      "--with_branch_heads",
       "--nohooks",
+      "-j8",
+      "--reset",
       "--force",
-      "--verbose",
+      "--upstream",
+      "--no-nag-max",
       "--delete_unversioned_trees",
-      "--with_branch_heads",
       "--revision",
       "third_party/WebKit@123",
       "--output-json",
       "/path/to/tmp/json"
     ],
     "cwd": "[SLAVE_BUILD]/src/third_party",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "[spec: WebKit] gclient sync",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"solutions\": {@@@",
       "@@@STEP_LOG_LINE@json.output@    \"WebKit/\": {@@@",
-      "@@@STEP_LOG_LINE@json.output@      \"revision\": 241198@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": \"3eebce6ea96f9e6c03e9252a4f8ef2ea9fe141c2\"@@@",
       "@@@STEP_LOG_LINE@json.output@    }, @@@",
       "@@@STEP_LOG_LINE@json.output@    \"src/blatley/\": {@@@",
-      "@@@STEP_LOG_LINE@json.output@      \"revision\": 248087@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": \"5e800497199d615131a76cd10651e74d7c8a0962\"@@@",
       "@@@STEP_LOG_LINE@json.output@    }@@@",
       "@@@STEP_LOG_LINE@json.output@  }@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@",
-      "@@@SET_BUILD_PROPERTY@got_blatley_revision@248087@@@"
+      "@@@SET_BUILD_PROPERTY@got_blatley_revision@\"5e800497199d615131a76cd10651e74d7c8a0962\"@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
+      "recurse",
+      "git",
+      "config",
+      "user.name",
+      "local_bot"
+    ],
+    "cwd": "[SLAVE_BUILD]/src/third_party",
+    "env": {
+      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+    },
+    "name": "[spec: WebKit] gclient recurse (git config user.name)"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
+      "recurse",
+      "git",
+      "config",
+      "user.email",
+      "local_bot@example.com"
+    ],
+    "cwd": "[SLAVE_BUILD]/src/third_party",
+    "env": {
+      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+    },
+    "name": "[spec: WebKit] gclient recurse (git config user.email)"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
       "\nimport os, sys\n\nbuild_path = sys.argv[1]\nif os.path.exists(build_path):\n  for (path, dir, files) in os.walk(build_path):\n    for cur_file in files:\n      if cur_file.endswith('index.lock'):\n        path_to_file = os.path.join(path, cur_file)\n        print 'deleting %s' % path_to_file\n        os.remove(path_to_file)\n",
       "[SLAVE_BUILD]"
     ],
     "name": "cleanup index.lock",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@import os, sys@@@",
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@build_path = sys.argv[1]@@@",
       "@@@STEP_LOG_LINE@python.inline@if os.path.exists(build_path):@@@",
@@ skipping 18 matching lines @@
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient runhooks"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]