Allow child layers to inherit color transform from their parent

The current implementation only uses the current layers color transform.
However, with the hierarchy structure, children should also inherit the color
transform set on their parent.

Test: SetColorTransformOnParent, SetColorTransformOnChildAndParent
Bug: 117408368
Change-Id: Ica539cefcde92203dd9ead0a732ee44a16978be0