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The callback function UpdateGpuInfoOnIO is added to the DX12/Vulkan info collection path. The data
is now saved in gpu_info of the browser process.

Both DX12 and Vulkan info collection functions are removed from the about:gpu path. The data can
be found in the gpu info. There is no need to call these two functions again.

BUG=775983
TEST=manual,Chrome://histograms
R=zmo@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: I6716aed172c8c6821f60124fb9cedc0c2e2b5079
Reviewed-on: https://chromium-review.googlesource.com/1026946Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553910}