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operator== should check all fields that are part of paint properties.

toString() should output all fields that are checked in operator==, so that we can
see what changed in the failure message of paint property under-invalidation.

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2606863002
Cr-Commit-Position: refs/heads/master@{#440901}