GitLab

Adding a utility method for generating unique filenames for offline page
based on title and url of the page.

(Re-uploading a change by Romax with fixed merge conflicts)

Bug: 757073
Change-Id: I03e8e5cc03a640de2abee8e6e903b6bdce53af24

TBR: dimich@chromium.org, dtrainor@chromium.org
Change-Id: I03e8e5cc03a640de2abee8e6e903b6bdce53af24
Reviewed-on: https://chromium-review.googlesource.com/911837Reviewed-by: Peter Williamson <petewil@chromium.org>
Commit-Queue: Peter Williamson <petewil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#535898}