The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ae6c6f26aa0ed2962d2680885136af82a839d168

commit ae6c6f26aa0ed2962d2680885136af82a839d168
Author: Tibor Goldschwendt <tiborg@chromium.org>
Date: Thu Jan 04 04:13:37 2018

[vr] Add snackbar shown when assets component becomes ready

The snackbar provides the user with the functionality to apply a new
background while in VR browsing mode.

This change is based on vollick@'s
https://chromium-review.googlesource.com/c/chromium/src/+/847732. Credit is due.

Bug:  798531 
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I60eae5fb37c6e9fea3192eb7e5f9b8bb0df6ee1d
Reviewed-on: https://chromium-review.googlesource.com/849312
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526917}
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/app/generated_resources.grd
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/android/vr_shell/vr_gl_thread.cc
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/android/vr_shell/vr_gl_thread.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/android/vr_shell/vr_shell.cc
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/android/vr_shell/vr_shell.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/assets.cc
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/assets.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/browser_ui_interface.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/elements/text.cc
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/elements/text.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/elements/text_input.cc
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/elements/text_unittest.cc
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/elements/toast.cc
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/elements/ui_element.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/elements/ui_element_name.cc
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/elements/ui_element_name.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/elements/ui_element_type.cc
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/elements/ui_element_type.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/elements/vector_icon.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/model/color_scheme.cc
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/model/color_scheme.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/model/model.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/test/mock_browser_ui_interface.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/test/mock_ui_browser_interface.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/testapp/vr_test_context.cc
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/testapp/vr_test_context.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/ui.cc
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/ui.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/ui_browser_interface.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/ui_scene_constants.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/ui_scene_creator.cc
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/ui_scene_creator.h
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/ui_unittest.cc
[modify] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/vector_icons/BUILD.gn
[add] https://crrev.com/ae6c6f26aa0ed2962d2680885136af82a839d168/chrome/browser/vr/vector_icons/file_download_done.icon