gpu: Keep original GMB alive to workaround problem with importing of UDL/EVDI buffers.

gpu: Keep original GMB alive to workaround problem with importing of UDL/EVDI buffers.

Destroying the original buffer invalidates kernel state such that
importing from the FD doesn't work as expected. By keeping the
original buffer alive we avoid this issue for scanout buffers used
by the browser process.

BUG=628334
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2171713004
Cr-Commit-Position: refs/heads/master@{#406973}
(cherry picked from commit 1ff18bae4738ee3d62c2310d9e03211054be0582)

Committed: https://chromium.googlesource.com/chromium/src/+/4621081d1ffdc8a9048430f7c3d2e60cc0e309cd

[reveman, 2016-07-22 18:08:13]

Description was changed from

==========
gpu: Keep original GMB alive to workaround problem with importing of UDL/EVDI
buffers.

Destroying the original buffer invalidates kernel state such that
importing from the FD doesn't work as expected. By keeping the
original buffer alive we avoid this issue for scanout buffers used
by the browser process.

BUG=628334
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2171713004
Cr-Commit-Position: refs/heads/master@{#406973}
(cherry picked from commit 1ff18bae4738ee3d62c2310d9e03211054be0582)
==========

to

==========
gpu: Keep original GMB alive to workaround problem with importing of UDL/EVDI
buffers.

Destroying the original buffer invalidates kernel state such that
importing from the FD doesn't work as expected. By keeping the
original buffer alive we avoid this issue for scanout buffers used
by the browser process.

BUG=628334
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2171713004
Cr-Commit-Position: refs/heads/master@{#406973}
(cherry picked from commit 1ff18bae4738ee3d62c2310d9e03211054be0582)

Committed:
https://chromium.googlesource.com/chromium/src/+/4621081d1ffdc8a9048430f7c3d2...
==========

[reveman, 2016-07-22 18:08:15]

Committed patchset #1 (id:1) manually as
4621081d1ffdc8a9048430f7c3d2e60cc0e309cd.