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This CL adds PWA implementation for |LaunchAppWithIntent|.

BUG=853604

Change-Id: I6257f8d473d1368f0e769b1cca332cc72808bf23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1851628
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705806}