Vulkan:Enable Validation best practices layer When Vulkan Validation layers are enabled, also enable the validation best practices layer which includes ARM's perfdoc layer. Initially adding skips for all of the best practices errors that are triggered so that these can be enabled by default. Bug: b/156661359 Change-Id: I7eab9710bf9632d07ff6b80375d3ad1789d58f7c Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2202634 Commit-Queue: Tobin Ehlis <tobine@google.com> Reviewed-by: Tobin Ehlis <tobine@google.com> Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com> Reviewed-by: Mohan Maiya <m.maiya@samsung.com> Reviewed-by: Cody Northrop <cnorthrop@google.com>