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This CL implements a method on the ARC IntentHelperHost to allow ARC to
request that a URL be opened as a web app in Chrome. If that URL does
not have a corresponding installed web app, the method falls back to
simply opening the URL in a tab.

An additional extension app launch source is added for the new launch
pathway.

BUG=893927

Change-Id: Ifbcc48f7cab65373dc6353d422580d6e9cc43796
Reviewed-on: https://chromium-review.googlesource.com/c/1282546Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: David Jacobo <djacobo@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601305}