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Move Convert from RGBA to RGB part into helper files.
Change the function to read known md5s and use base::ContainsValue to verify it.

BUG=chromium:834170
TEST=VDA unittest on eve and kevin
TEST=VDA unittest on non-Chrome OS platforms in CQ.

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: Ic965ee1668af67ecd04956bc89a29bf7a7de5f84
Reviewed-on: https://chromium-review.googlesource.com/1025535
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Pawel Osciak <posciak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555262}