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The state of WebApks is split across android settings and chrome
site settings. This change adds a dynamic android shortcut into
WebApks to make site settings more accessible.

The ManageDataLauncherActivity adds functionality for adding the
shortcut, checking whether the version of Chrome supports site settings,
and launching site settings through the chrome
ManageTrustedWebActivityLauncherActivity.
ManageTrustedWebActivityLauncherActivity was modified to include support
for WebApk verification.

Bug: 1119727
Change-Id: I90720ac83c4edf90056cc7b2692be1079b8643a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387764Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Commit-Queue: Pavol Drotár <pavoldrotar@google.com>
Auto-Submit: Pavol Drotár <pavoldrotar@google.com>
Cr-Commit-Position: refs/heads/master@{#809840}