The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/14d5ed2dd6b7ca8b6eea5875c9c64e142846e4b6

commit 14d5ed2dd6b7ca8b6eea5875c9c64e142846e4b6
Author: bshe <bshe@chromium.org>
Date: Thu Jun 29 03:36:00 2017

Update toast behavior and apperance according to UX requirement

BUG= 736761 

Review-Url: https://codereview.chromium.org/2957173002
Cr-Commit-Position: refs/heads/master@{#483281}

[modify] https://crrev.com/14d5ed2dd6b7ca8b6eea5875c9c64e142846e4b6/chrome/browser/android/vr_shell/BUILD.gn
[modify] https://crrev.com/14d5ed2dd6b7ca8b6eea5875c9c64e142846e4b6/chrome/browser/android/vr_shell/color_scheme.cc
[modify] https://crrev.com/14d5ed2dd6b7ca8b6eea5875c9c64e142846e4b6/chrome/browser/android/vr_shell/textures/exclusive_screen_toast_texture.cc
[add] https://crrev.com/14d5ed2dd6b7ca8b6eea5875c9c64e142846e4b6/chrome/browser/android/vr_shell/ui_elements/exclusive_screen_toast.cc
[add] https://crrev.com/14d5ed2dd6b7ca8b6eea5875c9c64e142846e4b6/chrome/browser/android/vr_shell/ui_elements/exclusive_screen_toast.h
[modify] https://crrev.com/14d5ed2dd6b7ca8b6eea5875c9c64e142846e4b6/chrome/browser/android/vr_shell/ui_elements/simple_textured_element.h
[modify] https://crrev.com/14d5ed2dd6b7ca8b6eea5875c9c64e142846e4b6/chrome/browser/android/vr_shell/ui_scene_manager.cc