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It will be needed in BMO's TabHelper to start installation.

It is similar to extensions::IsValidBookmarkAppUrl
but:
- Doesn't use extensions/common/url_pattern.h
- Reports chrome-extension:// url scheme as invalid.
- Reports filesystem: and any inner URL schemes as invalid.

Bug: 875698
Change-Id: I627a8e47593c698ef7acfc286cc310181b095685
Reviewed-on: https://chromium-review.googlesource.com/1180825
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584373}