download_actuals.py: download JSON files from Google Storage instead of skia-autogen

gm/rebaseline_server/server.py

Index: gm/rebaseline_server/server.py
diff --git a/gm/rebaseline_server/server.py b/gm/rebaseline_server/server.py
index 40874d603f63aa937cbf58a230e648428d243241..06807796704a5322af1a8427fc432ed0947f66fe 100755
--- a/gm/rebaseline_server/server.py
+++ b/gm/rebaseline_server/server.py
@@ -250,6 +250,8 @@ class Server(object):
             PARENT_DIRECTORY, STATIC_CONTENTS_SUBDIR, GENERATED_HTML_SUBDIR,
             "index.html"),
         config_pairs=config_pairs)
+    # TODO(epoger): Create shareable functions within download_actuals.py that
+    # we can use both there and here to download the actual image results.
     if actuals_repo_url:
       self._actuals_repo = _create_svn_checkout(
           dir_path=actuals_dir, repo_url=actuals_repo_url)