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[reland] When GPU process falls back to SwiftShader, about:gpu displays an extra copy of data for real GPU.

This was originally reviewed in https://chromium-review.googlesource.com/c/chromium/src/+/1017300.

BUG=828462,835343
TEST=manual in about:gpu
TBR=piman@chromium.org,dcheng@chromium.org,kbr@chromium.org,sadrul@chromium.org

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: I05db9214a8e9478ad69bb81cb10a3b3d4e9380c9
Reviewed-on: https://chromium-review.googlesource.com/1022506Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552536}