bot_update: Pass custom_vars dict to deps2git.

scripts/slave/bot_update.py

Index: scripts/slave/bot_update.py
diff --git a/scripts/slave/bot_update.py b/scripts/slave/bot_update.py
index bbba3e4ce8aaba077044c20f79a9c034a194881e..da16ae8405de56ac91143c7abd3e701d293621ca 100755
--- a/scripts/slave/bot_update.py
+++ b/scripts/slave/bot_update.py
@@ -819,6 +819,7 @@ def buildspecs2git(sln_dir, buildspec):
 
 def ensure_deps2git(solution, shallow):
   repo_base = path.join(os.getcwd(), solution['name'])
+  custom_vars = solution.get('custom_vars')
   deps_file = path.join(repo_base, 'DEPS')
   deps_git_file = path.join(repo_base, '.DEPS.git')
   if not git('ls-files', 'DEPS', cwd=repo_base).strip():
@@ -833,6 +834,8 @@ def ensure_deps2git(solution, shallow):
          '--cache_dir', CACHE_DIR,
          '--deps', deps_file,
          '--out', deps_git_file]
+  if custom_vars:
+    cmd.extend(['--var_overrides', json.dumps(custom_vars)])

[kjellander_chromium, 2014/10/03 09:00:50]

I doublechecked that an empty custom_vars dict doesn't cause any problems.

   if 'chrome-internal.googlesource' in solution['url']:
     cmd.extend(['--extra-rules', S2G_INTERNAL_PATH])
   if shallow: