Vulkan: Differentiate perf warnings and RP closure events ... and application events, by using different debug source enums, translating to different colors in API debuggers. Bug: angleproject:2472 Change-Id: Ice422c7ae59fb508a10500b9fbed79d4c9664c11 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3275840 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>