Starting to add implementation bugs for the creation and Java split work.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3d25962853b4898b6e6e163a222eea863d3ded4b

commit 3d25962853b4898b6e6e163a222eea863d3ded4b
Author: Ian Vollick <vollick@chromium.org>
Date: Mon Jul 30 20:07:14 2018

[vr] Split vr_ui and vr_base out of vr_common

This is derived from cjgrant@'s prototype and design (see
crrev.com/c/1134053)

It breaks a vr_ui target out of vr_common. The vr_base target
exists to satisfy the dependencies of vr_ui since it cannot
depend on vr_common.

Bug: 850674
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:linux_vr;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Iae0e11701213fca70e744b93228836a192e38065
Reviewed-on: https://chromium-review.googlesource.com/1154194
Commit-Queue: Ian Vollick <vollick@chromium.org>
Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579140}
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/android/vr/vr_gl_thread.cc
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/BUILD.gn
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/assets_loader.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/input_event.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/metrics/metrics_helper.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/metrics/session_metrics_helper.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/model/assets.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/model/controller_model.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/model/omnibox_suggestions.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/model/text_input_info.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/model/toolbar_state.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/platform_ui_input_delegate.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/pose_util.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/testapp/BUILD.gn
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/text_edit_action.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/ui.h
[add] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/ui_factory.cc
[add] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/ui_factory.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/ui_initial_state.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/ui_interface.h
[add] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/vr_base_export.h
[modify] https://crrev.com/3d25962853b4898b6e6e163a222eea863d3ded4b/chrome/browser/vr/vr_geometry_util.h

Bumping to M71 as discussed.

VR magic window needs to not depend on the GVR path ( issue 695937 ) so that we don't need to worry about whether the app is installed, especially since no user gesture is required.

We should probably also have a blocking bug for implementing the install flow for the VR presentation (Cardboard/Daydream) path.