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When the app doesn't exist in AppService, if the PauseApp is called, the
app is added to AppService with the app type Unknown, then later when
the app is added, the app type is changed to Web or Arc. In theory, the
app type should not be changed, so add the app type checking when pause
or unpause an app.

BUG=1055937

Change-Id: Iafd4befb6f7369977a3693d84994f3453876af7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089445Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747565}