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We now provide the three tags Android_Go, Android_One (*), and
Android_Svelte, to disable on individual kinds of low end devices; as
well as Android_Low_End to disable if the platform matches any of them.

(*) Android_One replaces the previously existing but more wordy
Cherry_Mobile_Android_One.

We also now disable gmail-background on low end devices only,
as it was originally intended.

Bug: 777355
Bug: 819577
Change-Id: I97824ca1f09677c8e80a5e06f5760bf153463748
Reviewed-on: https://chromium-review.googlesource.com/957025Reviewed-by: Charlie Andrews <charliea@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543669}