Add internal buckets for bootstrapping internal repos

BUG=261741

Review URL: https://codereview.chromium.org/313933005

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@274969 0039d316-1c4b-4281-b951-d872f2087c98

git_cache.py

@@ -143,7 +143,6 @@ class Mirror(object):
   gsutil_exe = os.path.join(
     os.path.dirname(os.path.abspath(__file__)),
     'third_party', 'gsutil', 'gsutil')
-  bootstrap_bucket = 'chromium-git-cache'
 
   def __init__(self, url, refs=None, print_func=None):
     self.url = url
@@ -152,6 +151,13 @@ class Mirror(object):
     self.mirror_path = os.path.join(self.GetCachePath(), self.basedir)
     self.print = print_func or print
 
+  @property
+  def bootstrap_bucket(self):
+    if 'chrome-internal' in self.url:
+      return 'chrome-git-cache'
+    else:
+      return 'chromium-git-cache'
+
   @classmethod
   def FromPath(cls, path):
     return cls(cls.CacheDirToUrl(path))