Set up a RenderState for the host version of RenderThread

CanvasContext expects the render thread to have a non-null render state
associated with it. This adds a render state to the host render thread.

Bug: 322360037
Test: build libhwui on host
Change-Id: Ied07d4bc86eec21ddbb1bfb6cfd45418c70edce0
3 files changed