gpu: Avoid creating two native pixmaps for the same buffer.

gpu: Avoid creating two native pixmaps for the same buffer.

For buffers allocated using CreateGpuMemoryBuffer, avoid
creating a second native pixmap for the same buffer as that
results in the associated GEM handle being closed twice.

BUG=631268
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/2188893002
Cr-Commit-Position: refs/heads/master@{#408268}
(cherry picked from commit 770b48e9e2c1e9d47b0c2a02c767a370b0adb3da)

Committed: https://chromium.googlesource.com/chromium/src/+/884189216f6a41a4bd49c43fe569a01b800150df

[reveman, 2016-07-27 23:48:11]

Description was changed from

==========
gpu: Avoid creating two native pixmaps for the same buffer.

For buffers allocated using CreateGpuMemoryBuffer, avoid
creating a second native pixmap for the same buffer as that
results in the associated GEM handle being closed twice.

BUG=631268
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/2188893002
Cr-Commit-Position: refs/heads/master@{#408268}
(cherry picked from commit 770b48e9e2c1e9d47b0c2a02c767a370b0adb3da)
==========

to

==========
gpu: Avoid creating two native pixmaps for the same buffer.

For buffers allocated using CreateGpuMemoryBuffer, avoid
creating a second native pixmap for the same buffer as that
results in the associated GEM handle being closed twice.

BUG=631268
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/2188893002
Cr-Commit-Position: refs/heads/master@{#408268}
(cherry picked from commit 770b48e9e2c1e9d47b0c2a02c767a370b0adb3da)

Committed:
https://chromium.googlesource.com/chromium/src/+/884189216f6a41a4bd49c43fe569...
==========

[reveman, 2016-07-27 23:48:12]

Committed patchset #1 (id:1) manually as
884189216f6a41a4bd49c43fe569a01b800150df.