Add deps file for manifest.  Use libwebp always.

Change-Id: I90fb96e43f68bdae88439d03e2e873fcb2effe2d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/256850
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
3 files changed