Set GPU rasterization trigger for OOPIFs

Set GPU rasterization trigger for OOPIFs

Currently the GPU rasterization trigger is never set on the compositor
for an out-of-process iframe. This patch changes it so that it is always
set.

BUG=712794
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2828023002
Cr-Commit-Position: refs/heads/master@{#467130}
(cherry picked from commit 1931faea0d5ada216fca3c11add153ceaa82ba6d)

Review-Url: https://codereview.chromium.org/2849173002 .
Cr-Commit-Position: refs/branch-heads/3071@{#326}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/6c3f45c74fa610abd2d45b6fd9305496bcd40d67

[kenrb, 2017-05-01 17:18:13]

Description was changed from

==========
Set GPU rasterization trigger for OOPIFs

Currently the GPU rasterization trigger is never set on the compositor
for an out-of-process iframe. This patch changes it so that it is always
set.

BUG=712794
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2828023002
Cr-Commit-Position: refs/heads/master@{#467130}
(cherry picked from commit 1931faea0d5ada216fca3c11add153ceaa82ba6d)
==========

to

==========
Set GPU rasterization trigger for OOPIFs

Currently the GPU rasterization trigger is never set on the compositor
for an out-of-process iframe. This patch changes it so that it is always
set.

BUG=712794
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2828023002
Cr-Commit-Position: refs/heads/master@{#467130}
(cherry picked from commit 1931faea0d5ada216fca3c11add153ceaa82ba6d)

Review-Url: https://codereview.chromium.org/2849173002 .
Cr-Commit-Position: refs/branch-heads/3071@{#326}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/6c3f45c74fa610abd2d45b6fd930...
==========

[kenrb, 2017-05-01 17:18:14]

Committed patchset #1 (id:1) manually as
6c3f45c74fa610abd2d45b6fd9305496bcd40d67.