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In pre-CompositeAfterPaint we have rare cases that a clip escapes an
effect's output clip. We have tolerated non-composited cases in
PaintChunksToCcLayers [1], and now we also tolerate composited cases
in PropertyTreeManager.

[1] https://cs.chromium.org/chromium/src/third_party/blink/renderer/platform/graphics/compositing/paint_chunks_to_cc_layer.cc?rcl=e4eadfd6f18ded4d369b8e0e7a7ef93018ff2b85&l=335

Bug: 927556
Change-Id: I0619116ab3b9e56bf839a849c51e8418e929d40c
Reviewed-on: https://chromium-review.googlesource.com/c/1456292
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630475}