Add internal buckets for bootstrapping internal repos

git_cache.py

Index: git_cache.py
diff --git a/git_cache.py b/git_cache.py
index 957ae9529c83454a78566fd54d031abf20392b66..0492a4657a65f548c9e21f88ccb67f3c9acabb6f 100755
--- a/git_cache.py
+++ b/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))