Vulkan: Initialize mLastSubmittedQueueSerial to valid value Currently, ContextVk::mLastFlushedQueueSerial and ContextVk::mLastSubmittedQueueSerial are invalid after Context initialization. Although, invalid QueueSerial will always test as submitted and finished, this produce a edge case. In case of SyncHelper::mUse, we can not longer assert that mUse.valid() after submitSyncIfDeferred() call, because invalid mUse is now a valid case... This CL initializes both members to valid value, that will also always test as submitted and finished. This removes the edge case, and allow using assert in SyncHelper to check if everything works as expected. Bug: b/277644512 Change-Id: I6be71596ab7dca1026764756fba7b21b81524413 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4503485 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Charlie Lao <cclao@google.com> Commit-Queue: Igor Nazarov <i.nazarov@samsung.com>