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Add PauseApp and UnpauseApp interfaces to AppService mojo, and
publishers. For extension apps and ARC apps, set the icon effects for
the paused apps.

The icon effect is set based on the paused field of App structure, so
pass the AppRegistryCache to ExtensionApps, to check the App's paused
status.

For ARC apps, the AppRegistryCache can get from AppServiceProxy.

BUG=1011235

Change-Id: Iced5e0f36ba5b1d036fd2431e5810832c59d423a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906851Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714782}