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Add DCHECK(thread_checker_.CalledOnValidThread()) so that a reader can figure
out easily what thread should execute a function.

BUG=None
TEST=VEA unittest on eve and veyron_minnie with dcheck_always_on

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I0f3f0a777f97cbb095d498fe8c70355377cdcf21
Reviewed-on: https://chromium-review.googlesource.com/1005374Reviewed-by: Pawel Osciak <posciak@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595437}