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This CL adds a UMA metrics to record permission request result from TWA.

Also renamed mRecorder in TWAPermissionManager to mUmaRecorder.

Bug: 1069506
Change-Id: I1ef8ec59d0763ebc23be2eb7bc142c45921bf410
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2219017
Commit-Queue: Ella Ge <eirage@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773804}