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Impending changes to Mojo IPC will require that handles serialized
as shared memory handles are actually shared memory handles. DXGI
resources are not, but are being transported using
GpuMemoryBufferHandle's shared_memory field.

This introduces a Windows-only GpuMemoryBufferHandle field for a
generic HANDLE to be used for DXGI resources, as well as a corresponding
mojom field for the same purpose.

There should be no net effect on the behavior of the system wrt handle
lifetime or usage.


Bug: 826213
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;master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I5d510e0ebdb60d4872fc428a95ce681dd18369dc
Reviewed-on: https://chromium-review.googlesource.com/1011600Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Bill Orr <billorr@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551231}