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This CL enables parsing and storing the capture_links field in web app
manifests while the kWebAppEnableLinkCapturing feature flag is enabled.

This CL is implementing the parsing side of this spec:
https://github.com/WICG/sw-launch/blob/master/declarative_link_capturing.md#proposal
including the following pending pull request to that spec:
https://github.com/WICG/sw-launch/pull/26

This CL does not implement the link capturing behaviours, that will
come in follow up CLs.

Bug: 1163398
Change-Id: I803ad87ea219ebceed35a547695a517020918c46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2623453Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843335}