main.py: Create dummy download option, set to False

This is needed b/c mtedit has a download option and common code that's
called from both expects options to have a download member.

I put this after the normal option parsing so it's not overwritten by
the option parsing.

BUG=chromium:242341
TEST="touchtests -c
p'https://feedback.corp.google.com/#/Report/821761747?context=ri'
lumpy/scroll_with_upper_thumb" didn't give me an error.

Change-Id: I680ae19f1ebb3d9dfb39fe5931ccea1f9ab301d1
Reviewed-on: https://gerrit.chromium.org/gerrit/55840
Reviewed-by: Dennis Kempin <denniskempin@chromium.org>
Tested-by: Andrew de los Reyes <adlr@chromium.org>
Commit-Queue: Andrew de los Reyes <adlr@chromium.org>
diff --git a/framework/src/main.py b/framework/src/main.py
index 8758d27..30fc139 100644
--- a/framework/src/main.py
+++ b/framework/src/main.py
@@ -266,6 +266,7 @@
                     dest="gdb", action="store_true", default=False,
                     help="Run the test case in GDB")
   (options, args) = parser.parse_args()
+  options.download = False  # For compatibility with mtedit
 
   if len(args) == 0:
     test_name = "all"