Begin renderpasses immediately in GrVkOpsRenderPass.

This change will allow us to easily switch between rendering to a
primary vs secondary command buffer.

Change-Id: Iaa066f24b64a686db41a1554b0d75c185714ef8c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/239100
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
4 files changed