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The change flags are for the current painting only. Clear them to avoid
unnecessary raster invalidation for paint property change in later
paintings.

Bug: 803867
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I2aebbd1e6342931d34bd2566983c9c22bdeabfc0
Reviewed-on: https://chromium-review.googlesource.com/920581Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537402}