Send a subtree of same-process PageStates for back/forward child frames.

Send a subtree of same-process PageStates for back/forward child frames.

This allows the renderer process to synchronously handle newly created
child frames for session history navigations, unless the browser process
has to be consulted for an out-of-process iframe.  This is necessary in
the case of about:blank (so that the parent can sychronously script the
child) and an optimization in other cases (avoiding per-frame IPCs).

BUG=671276
TEST=See bug for repro steps
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

[Charlie Reis, 2016-12-05 07:56:51]

Description was changed from

==========
Send a subtree of same-process PageStates for back/forward child frames.

This allows the renderer process to synchronously handle newly created
child frames for session history navigations, unless the browser process
has to be consulted for an out-of-process iframe.  This is necessary in
the case of about:blank (so that the parent can sychronously script the
child) and an optimization in other cases (avoiding per-frame IPCs).

BUG=
TEST=
==========

to

==========
Send a subtree of same-process PageStates for back/forward child frames.

This allows the renderer process to synchronously handle newly created
child frames for session history navigations, unless the browser process
has to be consulted for an out-of-process iframe.  This is necessary in
the case of about:blank (so that the parent can sychronously script the
child) and an optimization in other cases (avoiding per-frame IPCs).

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

[Charlie Reis, 2016-12-05 07:56:55]

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

[commit-bot: I haz the power, 2016-12-05 07:57:02]

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, 2016-12-05 08:28:55]

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

[commit-bot: I haz the power, 2016-12-05 08:28:56]

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

[Charlie Reis, 2016-12-05 18:41:32]

Description was changed from

==========
Send a subtree of same-process PageStates for back/forward child frames.

This allows the renderer process to synchronously handle newly created
child frames for session history navigations, unless the browser process
has to be consulted for an out-of-process iframe.  This is necessary in
the case of about:blank (so that the parent can sychronously script the
child) and an optimization in other cases (avoiding per-frame IPCs).

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

to

==========
Send a subtree of same-process PageStates for back/forward child frames.

This allows the renderer process to synchronously handle newly created
child frames for session history navigations, unless the browser process
has to be consulted for an out-of-process iframe.  This is necessary in
the case of about:blank (so that the parent can sychronously script the
child) and an optimization in other cases (avoiding per-frame IPCs).

BUG=671276
TEST=See bug for repro steps
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation
==========

[Charlie Reis, 2016-12-10 01:04:45]

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

[commit-bot: I haz the power, 2016-12-10 01:05:23]

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, 2016-12-10 01:56:25]

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

[commit-bot: I haz the power, 2016-12-10 01:56:26]

Dry run: Try jobs failed on following builders:
  win_chromium_x64_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)