Draw WebView in an offscreen GL buffer, then import and draw the
buffer with Vulkan.
Bug: 115610873
Test: Passed WebView CTS tests that are part of UiRendering.
Change-Id: Ida137fe9b8652d2a936ec2798b909be7e77b3462
Initial attempt at selective bitmap inverting
Use CIE_LAB colorspace for inverting instead of HSV
Test: Manually poking around
Change-Id: I014ff31eeae471ee7f6a40a6daa4e7099c2a7ff8