Update RenderEngine to use newer SkRuntimeEffect::MakeForShader

This enforces stricter rules on the SkSL at effect creation time, and
ensures it's valid as an SkShader (vs. an SkColorFilter).

Bug: skia:11813
Change-Id: Iddba9361a453fd4adc8ffd8fd41c0b0ab2905fad
(cherry picked from commit fe13a4a8860cf544e1d218310b331f535ad96100)
2 files changed