Separate @viewport from other RuleSet construction.

Separate @viewport from other RuleSet construction.

Which rules goes into the RuleSet for a stylesheet depends on the
evaluation of the media queries. The evaluation of the media queries
depends on @viewport rules.

We have been collecting @viewport rules along with other rules which
means we have been evaluating media queries as if the viewport rules
are not there, and re-construct the RuleSet afterwards if the @viewport
rules caused the viewport to change, hence caused viewport dependent
media queries to change.

The default stylesheets for viewport rules no longer create RuleSets as
they are not needed.

BUG=567021

[rune, 2016-10-11 15:11:05]

The CQ bit was checked by rune@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2016-10-11 15:11:19]

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, 2016-10-11 15:32:36]

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

[commit-bot: I haz the power, 2016-10-11 15:32:37]

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

[rune, 2016-10-12 10:48:06]

The CQ bit was checked by rune@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2016-10-12 10:48:21]

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, 2016-10-12 11:00:18]

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

[commit-bot: I haz the power, 2016-10-12 11:00:19]

Dry run: Try jobs failed on following builders:
  chromeos_amd64-generic_chromium_compile_only_ng on
master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromeos_amd64-...)
  linux_chromium_chromeos_ozone_rel_ng on master.tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[rune, 2016-10-12 11:10:16]

The CQ bit was checked by rune@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2016-10-12 11:10:25]

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, 2016-10-12 12:26:12]

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

[commit-bot: I haz the power, 2016-10-12 12:26:13]

Dry run: Exceeded global retry quota

[rune, 2016-10-13 08:21:09]

The CQ bit was checked by rune@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2016-10-13 08:21:21]

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, 2016-10-13 09:30:00]

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

[commit-bot: I haz the power, 2016-10-13 09:30:02]

Dry run: This issue passed the CQ dry run.

[rune, 2016-10-18 17:06:34]

Description was changed from

==========
Separate @viewport from other RuleSet construction.

Which rules goes into the RuleSet for a stylesheet depends on the
evaluation of the media queries. The evaluation of the media queries
depends on @viewport rules.

We have been collecting @viewport rules along with other rules which
means we have been evaluating media queries as if the viewport rules
are not there, and re-construct the RuleSet afterwards if the @viewport
rules caused the viewport to change, hence caused viewport dependent
media queries to change.

The default stylesheets for viewport rules no longer create RuleSets as
they are not needed.

BUG=567021
==========

to

==========
Separate @viewport from other RuleSet construction.

Which rules goes into the RuleSet for a stylesheet depends on the
evaluation of the media queries. The evaluation of the media queries
depends on @viewport rules.

We have been collecting @viewport rules along with other rules which
means we have been evaluating media queries as if the viewport rules
are not there, and re-construct the RuleSet afterwards if the @viewport
rules caused the viewport to change, hence caused viewport dependent
media queries to change.

The default stylesheets for viewport rules no longer create RuleSets as
they are not needed.

BUG=567021
==========