Fix chromium update in auto-roller.

tools/push-to-trunk/chromium_roll.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 import argparse
 import os
 import sys
 
 from common_includes import *
@@ skipping 55 matching lines @@
 
 
 class UpdateChromiumCheckout(Step):
   MESSAGE = "Update the checkout and create a new branch."
   REQUIRES = "chrome_path"
 
   def RunStep(self):
     os.chdir(self["chrome_path"])
     self.GitCheckout("master")
     self._side_effect_handler.Command("gclient", "sync --nohooks")
+    try:
+      # TODO(machenbach): Add cwd to git calls.
+      os.chdir(os.path.join(self["chrome_path"], "v8"))
+      self.GitFetchOrigin()

[Ryan Tseng, 2014/08/27 10:19:44]

This is going to run into the same problem as before (need to fetch to cache,
then fetch to repo)

Seeing how gclient's only reason for existence is to fetch subprojects.... I
think theres something else wrong here.

+    finally:
+      os.chdir(self["chrome_path"])
     self.GitCreateBranch("v8-roll-%s" % self["trunk_revision"])
 
 
 class UploadCL(Step):
   MESSAGE = "Create and upload CL."
   REQUIRES = "chrome_path"
 
   def RunStep(self):
     os.chdir(self["chrome_path"])
 
@@ skipping 83 matching lines @@
       SwitchChromium,
       UpdateChromiumCheckout,
       UploadCL,
       SwitchV8,
       CleanUp,
     ]
 
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(ChromiumRoll(CONFIG).Run())