Exclude OWNERS and README.md files while uploading screenshots

Bug: 814906
Change-Id: I34fea3500218fee452d2c6134002cdb3aa43d071
Reviewed-on: https://chromium-review.googlesource.com/1149085Reviewed-by: anthonyvd <anthonyvd@chromium.org>
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579443}

tools/translation/testdata/part_grdp/OWNERS

+# This OWNERS file is for testing. Point it to the original so as not to break
+# this directory.
+file://tools/translation/OWNERS

tools/translation/testdata/test_grd/README.md

+Test readme file
\ No newline at end of file

tools/translation/upload_screenshots.py

@@ -131,7 +131,7 @@ def find_screenshots(repo_root, translation_expectations):
     if not os.path.exists(screenshots_dir):
       continue
     for f in os.listdir(screenshots_dir):
-      if f.endswith('.sha1'):
+      if f in ('OWNERS', 'README.md') or f.endswith('.sha1'):
         continue
       if not f.endswith('.png'):
         print 'File with unexpected extension: %s in %s' % (f, screenshots_dir)