Add LayoutOpportunityIterator method to NGConstraintSpace

Add LayoutOpportunityIterator method to NGConstraintSpace

LayoutOpportunityIterator method returns a default layout opportunity
iterator that starts from NGConstraintSpace::BfcOffset. It's invalidated
when a new exclusion is added.
Usage example: NGInlineBuilder needs to iterate over available
opportunities.

BUG=635619
Review-Url: https://codereview.chromium.org/2734923002
Cr-Commit-Position: refs/heads/master@{#455220}
Committed: https://chromium.googlesource.com/chromium/src/+/b5f30def1f14944ea1d342b99c2afcd693a31278

[Gleb Lanbin, 2017-03-06 20:22:05]

glebl@chromium.org changed reviewers:
+ ikilpatrick@chromium.org

[Gleb Lanbin, 2017-03-06 21:02:56]

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

[commit-bot: I haz the power, 2017-03-06 21:03:25]

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, 2017-03-06 22:47:34]

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

[commit-bot: I haz the power, 2017-03-06 22:47:35]

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_...)

[Gleb Lanbin, 2017-03-06 23:04:11]

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

[commit-bot: I haz the power, 2017-03-06 23:04:59]

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, 2017-03-07 01:17:06]

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

[commit-bot: I haz the power, 2017-03-07 01:17:07]

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

[Gleb Lanbin, 2017-03-07 17:20:12]

Description was changed from

==========
Add LayoutOpportunityIterator method to NGConstraintSpace

LayoutOpportunityIterator method returns a default layout opportunity
iterator that starts from NGConstraintSpace::BfcOffset. It's invalidated
when a new exclusion is added.
Usage example: NGInlineBuilder needs to iterate over available
opportunities.

BUG=635619
==========

to

==========
Add LayoutOpportunityIterator method to NGConstraintSpace

LayoutOpportunityIterator method returns a default layout opportunity
iterator that starts from NGConstraintSpace::BfcOffset. It's invalidated
when a new exclusion is added.
Usage example: NGInlineBuilder needs to iterate over available
opportunities.

BUG=635619
==========

[Gleb Lanbin, 2017-03-07 17:20:12]

glebl@chromium.org changed reviewers:
+ cbiesinger@chromium.org

[cbiesinger, 2017-03-07 18:52:40]

lgtm

[Gleb Lanbin, 2017-03-07 19:02:28]

The CQ bit was checked by glebl@chromium.org

[commit-bot: I haz the power, 2017-03-07 19:05:10]

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, 2017-03-07 21:08:56]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1488913348616370, "parent_rev":
"906adfec35ab217d2be4f851cbefb85400d43eab", "commit_rev":
"b5f30def1f14944ea1d342b99c2afcd693a31278"}

[commit-bot: I haz the power, 2017-03-07 21:09:38]

Description was changed from

==========
Add LayoutOpportunityIterator method to NGConstraintSpace

LayoutOpportunityIterator method returns a default layout opportunity
iterator that starts from NGConstraintSpace::BfcOffset. It's invalidated
when a new exclusion is added.
Usage example: NGInlineBuilder needs to iterate over available
opportunities.

BUG=635619
==========

to

==========
Add LayoutOpportunityIterator method to NGConstraintSpace

LayoutOpportunityIterator method returns a default layout opportunity
iterator that starts from NGConstraintSpace::BfcOffset. It's invalidated
when a new exclusion is added.
Usage example: NGInlineBuilder needs to iterate over available
opportunities.

BUG=635619

Review-Url: https://codereview.chromium.org/2734923002
Cr-Commit-Position: refs/heads/master@{#455220}
Committed:
https://chromium.googlesource.com/chromium/src/+/b5f30def1f14944ea1d342b99c2a...
==========

[commit-bot: I haz the power, 2017-03-07 21:09:39]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/b5f30def1f14944ea1d342b99c2a...