Fix draw order for non-RenderNode draw commands

Fix a drawing order issue in Skia pipeline. Add unit test in both
HWUI and Skia to test the fix.

Test: built and ran on angler-eng and HWUI unit tests passed.
Bug: 32506749
Change-Id: I7f13457726a8664f18a46aca2279b876acec2944
4 files changed