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Android truncates long logs in __android_log_write. This is useful
to avoid too verbose logs and save cpu/memory, but we do need some
complete verbose logs for debugging.

Now if DCHECK_IS_ON(), split long logs by new lines and call
__android_log_write for each line to avoid the truncation.

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ib19c718a8f1d2fe1f2e155c38e1106174b38ae02
Reviewed-on: https://chromium-review.googlesource.com/c/1281883
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600111}