[Slimming Paint] Turn off low-quality image painting heuristics for slimming paint.
[Slimming Paint] Turn off low-quality image painting heuristics for slimming paint.

If needed, these will be re-implemented in the raster phase of cc.

BUG=382491

Review URL: https://codereview.chromium.org/808973003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@187796 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs