InProcessCommandBuffer calls Flush() every time OrderingBarrier() is called. This isn't necessary and could have some performance impact. Since there is no shared GPU channel for InProcessCommandBuffer we don't need to do anything immediately for OrderingBarrier(), but we do need to call Flush() with the right put_offset if FlushPendingWork() gets called afterwards. I think the following changes would work:

1. InProcessCommandBuffer::OrderingBarrier() shouldn't call Flush(). Instead it should store |put_offset| in a member variable.
2. InProcessCommandBuffer::Flush() should reset the stored |put_offset|.
3. InProcessCommandBuffer::FlushPendingWork() should call Flush() with the stored |put_offset| if there is a value stored there.

It's not clear if InProcessCommandBuffer::EnsureWorkVisible() should change. piman@ mentioned changing it in slack, but the description on GpuControl::EnsureWorkVisible() specifies it's a no-op for in process command buffers.