When a command buffer is ended, bindings are lost. This adds a dirty
bit to `mNewGraphicsCommandBufferDirtyBits` to make sure transform
feedback buffers are bound again on the new command buffer.
Bug: angleproject:5428
Change-Id: I7733c93b1eb5d33a77cbee231a83199be950e19f
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2611552
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
