OOPIF support for layout test pixel dumps.

OOPIF support for layout test pixel dumps.

This CL moves gathering of pixel dumps for layout tests from
the renderer process to the browser process.  This move helps
ensure that pixel dumps are OOPIF-friendly.

DO NOT SUBMIT: There are still quite a few unsolved issues in this CL:
1. kDisableThreadedCompositing
2. TestLayerTreeFrameSink (needed for pixel_dump.cc)
   This is a potential big clean-up / code deletion opportunity here.
3. 10-seconds delay
4. Some pixel dumps need to stay in the renderer process
   (is_printing + dump_selection_rect)

BUG=667551
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_site_isolation

[Łukasz Anforowicz, 2017-07-10 16:44:09]

Description was changed from

==========
OOPIF support for layout test pixel dumps.

This CL moves gathering of pixel dumps for layout tests from
the renderer process to the browser process.  This move helps
ensure that pixel dumps are OOPIF-friendly.

DO NOT SUBMIT: There are still quite a few unsolved issues in this CL:
1. kDisableThreadedCompositing
2. TestLayerTreeFrameSink (needed for pixel_dump.cc)
   This is a potential big clean-up / code deletion opportunity here.
3. 10-seconds delay
4. Some pixel dumps need to stay in the renderer process
   (is_printing + dump_selection_rect)

BUG=667551
==========

to

==========
OOPIF support for layout test pixel dumps.

This CL moves gathering of pixel dumps for layout tests from
the renderer process to the browser process.  This move helps
ensure that pixel dumps are OOPIF-friendly.

DO NOT SUBMIT: There are still quite a few unsolved issues in this CL:
1. kDisableThreadedCompositing
2. TestLayerTreeFrameSink (needed for pixel_dump.cc)
   This is a potential big clean-up / code deletion opportunity here.
3. 10-seconds delay
4. Some pixel dumps need to stay in the renderer process
   (is_printing + dump_selection_rect)

BUG=667551
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation
==========

[Łukasz Anforowicz, 2017-07-10 16:44:11]

Description was changed from

==========
OOPIF support for layout test pixel dumps.

This CL moves gathering of pixel dumps for layout tests from
the renderer process to the browser process.  This move helps
ensure that pixel dumps are OOPIF-friendly.

DO NOT SUBMIT: There are still quite a few unsolved issues in this CL:
1. kDisableThreadedCompositing
2. TestLayerTreeFrameSink (needed for pixel_dump.cc)
   This is a potential big clean-up / code deletion opportunity here.
3. 10-seconds delay
4. Some pixel dumps need to stay in the renderer process
   (is_printing + dump_selection_rect)

BUG=667551
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation
==========

to

==========
OOPIF support for layout test pixel dumps.

This CL moves gathering of pixel dumps for layout tests from
the renderer process to the browser process.  This move helps
ensure that pixel dumps are OOPIF-friendly.

DO NOT SUBMIT: There are still quite a few unsolved issues in this CL:
1. kDisableThreadedCompositing
2. TestLayerTreeFrameSink (needed for pixel_dump.cc)
   This is a potential big clean-up / code deletion opportunity here.
3. 10-seconds delay
4. Some pixel dumps need to stay in the renderer process
   (is_printing + dump_selection_rect)

BUG=667551
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_site_isolation
==========

[Łukasz Anforowicz, 2017-07-12 22:17:25]

The CQ bit was checked by lukasza@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-07-12 22:17:44]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-07-12 22:21:14]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-07-12 22:21:16]

Dry run: Try jobs failed on following builders:
  mac_chromium_compile_dbg_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)

[Łukasz Anforowicz, 2017-07-12 22:51:10]

The CQ bit was checked by lukasza@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-07-12 22:51:26]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-07-12 23:00:24]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-07-12 23:00:25]

Dry run: Try jobs failed on following builders:
  chromium_presubmit on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)