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This patch allows block-level NGPaintFragment invalidations to be
traced, to make relevant layout tests pass.

Note: This is a hacky fix only for making tests pass, since devtools
invalidation tracking is still an experimental feature. More work will
be done if the feature is launched.

Bug: 880519
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I6bfcd0204a66ea266e2de7a6a421fea29dc70fbf
Reviewed-on: https://chromium-review.googlesource.com/1204851Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589101}