Flush contexts after LayerTreeHostImpl cleanup

Flush contexts after LayerTreeHostImpl cleanup

Currently, we do not flush our GL contexts after cleaning up
LayerTreeHostImpl (LTHI) resources. This delays the time it takes for
these deletes to reach the GPU process, and can allow driver caches to
grow unnecessarily.

This CL does a ShallowFlushCHROMIUM after freeing LTHI resources, which
reduces cache growth on some platforms (observed on N9).

R=vmpstr
BUG=643251
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

Review-Url: https://codereview.chromium.org/2358593002
Cr-Commit-Position: refs/heads/master@{#419874}
(cherry picked from commit d3bd7f0bacd5e2141ddb9f08335a9157da367b14)

Committed: https://chromium.googlesource.com/chromium/src/+/c850e8a84cb5c6effd3d12ab76d85ac5194e3187

[ericrk, 2016-09-22 19:44:53]

Description was changed from

==========
Flush contexts after LayerTreeHostImpl cleanup

Currently, we do not flush our GL contexts after cleaning up
LayerTreeHostImpl (LTHI) resources. This delays the time it takes for
these deletes to reach the GPU process, and can allow driver caches to
grow unnecessarily.

This CL does a ShallowFlushCHROMIUM after freeing LTHI resources, which
reduces cache growth on some platforms (observed on N9).

R=vmpstr
BUG=643251
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

Review-Url: https://codereview.chromium.org/2358593002
Cr-Commit-Position: refs/heads/master@{#419874}
(cherry picked from commit d3bd7f0bacd5e2141ddb9f08335a9157da367b14)
==========

to

==========
Flush contexts after LayerTreeHostImpl cleanup

Currently, we do not flush our GL contexts after cleaning up
LayerTreeHostImpl (LTHI) resources. This delays the time it takes for
these deletes to reach the GPU process, and can allow driver caches to
grow unnecessarily.

This CL does a ShallowFlushCHROMIUM after freeing LTHI resources, which
reduces cache growth on some platforms (observed on N9).

R=vmpstr
BUG=643251
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

Review-Url: https://codereview.chromium.org/2358593002
Cr-Commit-Position: refs/heads/master@{#419874}
(cherry picked from commit d3bd7f0bacd5e2141ddb9f08335a9157da367b14)

Committed:
https://chromium.googlesource.com/chromium/src/+/c850e8a84cb5c6effd3d12ab76d8...
==========

[ericrk, 2016-09-22 19:44:54]

Committed patchset #1 (id:1) manually as
c850e8a84cb5c6effd3d12ab76d85ac5194e3187.