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This CL does two things:

- In order to move VR Java code into its own module move the code into a
  separate android_library target.

- As a result of the separate library target we may miss making the VR
  JNI registrations (in case VR moves out of chrome_public_apk). Thus,
  separate the JNI registration generation for VR and register VR JNI
  calls in VR code.

Bug: 862694
Change-Id: I2b78cea7b30725d5f2b51afbcac1a6add555f355
Reviewed-on: https://chromium-review.googlesource.com/1158715
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581576}