Move SourceRange and CSSPropertySourceData classes off-heap.

Move SourceRange and CSSPropertySourceData classes off-heap.

SourceRange is a value/POD class that has no complex
sharing or lifetime handling associated with it. It does not
meet minimal requirements that we've now settled on for when
an object ought to be Oilpan managed -- doesn't have other
heap references nor sharing&lifetime issues that would benefit
from Oilpan use -- hence, we should move it off-heap.

With SourceRange off-heap, a number of classes that package up
SourceRanges in various ways can be converted to off-heap
classes also.

R=
BUG=

Committed: https://crrev.com/76d48b679c0f977b5ba276e28e24d4b820d6bd73
Cr-Commit-Position: refs/heads/master@{#399428}

[sof, 2016-06-12 18:11:51]

Description was changed from

==========
Move CSSPropertySourceDatas off-heap.

Do not meet the bar for being on the heap.

R=
BUG=
==========

to

==========
Move SourceRange and CSSPropertySourceData classes off-heap.

SourceRange is a value/POD class that has no complex
sharing or lifetime handling associated with it. It does not
meet minimal requirements that we've now settled on for when
an object ought to be Oilpan managed -- doesn't have other
heap references nor sharing&lifetime issues that would benefit
from Oilpan use -- hence, we should move it off-heap.

With SourceRange off-heap, a number of classes that package up
SourceRanges in various ways can be converted to off-heap
classes also.

R=
BUG=
==========

[sof, 2016-06-12 18:19:53]

sigbjornf@opera.com changed reviewers:
+ dgozman@chromium.org, oilpan-reviews@chromium.org

[sof, 2016-06-12 18:19:53]

please take a look.

afaict, SourceRange is the one remaining POD type that's on the Oilpan heap, but
that we would prefer weren't with Oilpan v1.

Unlikely that it & the derived CSSPropertySourceData objects are putting undue
strains on the garbage collector, so they could remain just fine, but having
trivial POD types with empty trace methods is something we want to avoid.

(Discovered while experimenting with clang GC plugin support for reporting
"unnecessary" tracing.)

[haraken, 2016-06-13 00:47:05]

LGTM

[sof, 2016-06-13 09:24:55]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2016-06-13 09:25:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2060433002/20001

[commit-bot: I haz the power, 2016-06-13 10:17:32]

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

[commit-bot: I haz the power, 2016-06-13 10:17:34]

Try jobs failed on following builders:
  win8_chromium_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win8_chromium_ng/...)

[sof, 2016-06-13 10:37:44]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2016-06-13 10:37:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2060433002/20001

[commit-bot: I haz the power, 2016-06-13 11:04:18]

Description was changed from

==========
Move SourceRange and CSSPropertySourceData classes off-heap.

SourceRange is a value/POD class that has no complex
sharing or lifetime handling associated with it. It does not
meet minimal requirements that we've now settled on for when
an object ought to be Oilpan managed -- doesn't have other
heap references nor sharing&lifetime issues that would benefit
from Oilpan use -- hence, we should move it off-heap.

With SourceRange off-heap, a number of classes that package up
SourceRanges in various ways can be converted to off-heap
classes also.

R=
BUG=
==========

to

==========
Move SourceRange and CSSPropertySourceData classes off-heap.

SourceRange is a value/POD class that has no complex
sharing or lifetime handling associated with it. It does not
meet minimal requirements that we've now settled on for when
an object ought to be Oilpan managed -- doesn't have other
heap references nor sharing&lifetime issues that would benefit
from Oilpan use -- hence, we should move it off-heap.

With SourceRange off-heap, a number of classes that package up
SourceRanges in various ways can be converted to off-heap
classes also.

R=
BUG=
==========

[commit-bot: I haz the power, 2016-06-13 11:04:19]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-06-13 11:04:21]

CQ bit was unchecked

[commit-bot: I haz the power, 2016-06-13 11:05:44]

Description was changed from

==========
Move SourceRange and CSSPropertySourceData classes off-heap.

SourceRange is a value/POD class that has no complex
sharing or lifetime handling associated with it. It does not
meet minimal requirements that we've now settled on for when
an object ought to be Oilpan managed -- doesn't have other
heap references nor sharing&lifetime issues that would benefit
from Oilpan use -- hence, we should move it off-heap.

With SourceRange off-heap, a number of classes that package up
SourceRanges in various ways can be converted to off-heap
classes also.

R=
BUG=
==========

to

==========
Move SourceRange and CSSPropertySourceData classes off-heap.

SourceRange is a value/POD class that has no complex
sharing or lifetime handling associated with it. It does not
meet minimal requirements that we've now settled on for when
an object ought to be Oilpan managed -- doesn't have other
heap references nor sharing&lifetime issues that would benefit
from Oilpan use -- hence, we should move it off-heap.

With SourceRange off-heap, a number of classes that package up
SourceRanges in various ways can be converted to off-heap
classes also.

R=
BUG=

Committed: https://crrev.com/76d48b679c0f977b5ba276e28e24d4b820d6bd73
Cr-Commit-Position: refs/heads/master@{#399428}
==========

[commit-bot: I haz the power, 2016-06-13 11:05:46]

Patchset 2 (id:??) landed as
https://crrev.com/76d48b679c0f977b5ba276e28e24d4b820d6bd73
Cr-Commit-Position: refs/heads/master@{#399428}