Adding a flag for saving with new Password Form parsing.

On CL https://chromium-review.googlesource.com/c/chromium/src/+/1016648 it was added flag
for new Password Form parsing in general. But since now it's used for launching in M-69
filling with the new parsing, another flag for saving is required for development (and
launching it later). This CL adds it.

Bug: 831123
Change-Id: Ic475da832d041d464f870ff96bd3b3bc76f838c1
Reviewed-on: https://chromium-review.googlesource.com/1148202
Commit-Queue: Vadym Doroshenko <dvadym@chromium.org>
Reviewed-by: Vaclav Brozek <vabr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577508}
6 files changed