Wrap some global vulkan methods which depend on env variables ANGLE scoped sets some envion variables during initialization. Those env variables will change some vulkan global methods behavior. So to make sure those global methods have same behavior, this CL wraps those global methods, and sets those envion variables before call those vulkan methods. Bug: chromium:1264439 Change-Id: Ie4e29884fcf5b67f4e53ddd3c90a9ade7b226a1f Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3379209 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Peng Huang <penghuang@chromium.org>