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If running component updates in a background task we won't instantiate
an activity. As a consequence we won't register the VR assets component
and never get updates for it in the background. To solve this, register
the component in native.

The component gets only registered if the user has a Daydream headset
paired. Checking this is expensive. Thus, we save whether the component
should be registered in user preferences. At Chrome startup (which may
happen when running an update task in the background) read this flag
and conditionally register the component. Reading the flag took less
than 1 ms in my tests.

Change-Id: I1e9d0f6caab094307f8f3397c913cc1b7431d8fa
Reviewed-on: https://chromium-review.googlesource.com/1132147Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575038}