GitLab

This CL updates the following parameters.
  Position of the buttons
  Background color
  Buttons colors
  The gap between the text and the icon
  Position of the audio prompt

Bug: 
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: I9fe0f6037333c1fb3c19111157999c151faffec4
Reviewed-on: https://chromium-review.googlesource.com/772403Reviewed-by: Biao She <bshe@chromium.org>
Commit-Queue: Amirhossein Simjour <asimjour@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517153}