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Previously they were guarded by #ifndef NDEBUG because paint record
dumping was only available in debug build.

Now still guard by DCHECK_IS_ON() so that we won't build them into
official releases.

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I22886cd7a7fc1ef34069944534c6be79af63f757
Reviewed-on: https://chromium-review.googlesource.com/941419Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539927}