Move AX local bounding box calculation into LayoutObject

Move AX local bounding box calculation into LayoutObject

Minor refactoring. Now that we've successfully switched
to using relative bounding boxes in the accessibility tree,
it's cleaner to have AXObject call a single interface on
LayoutObject rather than calling different code depending
on the type of LayoutObject.

This will also help ensure this doesn't break the next
time the layout code is refactored.

This is covered by existing tests, in particular
accessibility/bounds-calc.html tests a few examples of each
of the four types of LayoutObject that need to implement
this method.

BUG=618120
Committed: https://crrev.com/64a061448438227cdd16d73d4d6944de6c5ddfd7
Cr-Commit-Position: refs/heads/master@{#417775}

[dmazzoni, 2016-09-08 16:10:44]

Description was changed from

==========
localBoundingBoxRectForAccessibility
==========

to

==========
Move AX local bounding box calculation into LayoutObject 

Minor refactoring. Now that we've successfully switched
to using relative bounding boxes in the accessibility tree,
it's cleaner to have AXObject call a single interface on
LayoutObject rather than calling different code depending
on the type of LayoutObject.

This will also help ensure this doesn't break the next
time the layout code is refactored.

This is covered by existing tests, in particular
accessibility/bounds-calc.html tests a few examples of each
of the four types of LayoutObject that need to implement
this method.

BUG=618120
==========

[dmazzoni, 2016-09-08 16:10:44]

dmazzoni@chromium.org changed reviewers:
+ chrishtr@chromium.org

[dmazzoni, 2016-09-08 16:12:08]

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

[commit-bot: I haz the power, 2016-09-08 16:12:41]

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, 2016-09-08 16:15:20]

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

[commit-bot: I haz the power, 2016-09-08 16:15:21]

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_...)

[chrishtr, 2016-09-09 17:51:10]

lgtm

[dmazzoni, 2016-09-09 22:24:29]

The CQ bit was checked by dmazzoni@chromium.org

[dmazzoni, 2016-09-09 22:24:29]

The patchset sent to the CQ was uploaded after l-g-t-m from
chrishtr@chromium.org
Link to the patchset: https://codereview.chromium.org/2324603002/#ps40001
(title: "Rebase")

[commit-bot: I haz the power, 2016-09-09 22:25:04]

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, 2016-09-10 00:21:28]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-09-10 00:24:00]

Description was changed from

==========
Move AX local bounding box calculation into LayoutObject 

Minor refactoring. Now that we've successfully switched
to using relative bounding boxes in the accessibility tree,
it's cleaner to have AXObject call a single interface on
LayoutObject rather than calling different code depending
on the type of LayoutObject.

This will also help ensure this doesn't break the next
time the layout code is refactored.

This is covered by existing tests, in particular
accessibility/bounds-calc.html tests a few examples of each
of the four types of LayoutObject that need to implement
this method.

BUG=618120
==========

to

==========
Move AX local bounding box calculation into LayoutObject

Minor refactoring. Now that we've successfully switched
to using relative bounding boxes in the accessibility tree,
it's cleaner to have AXObject call a single interface on
LayoutObject rather than calling different code depending
on the type of LayoutObject.

This will also help ensure this doesn't break the next
time the layout code is refactored.

This is covered by existing tests, in particular
accessibility/bounds-calc.html tests a few examples of each
of the four types of LayoutObject that need to implement
this method.

BUG=618120

Committed: https://crrev.com/64a061448438227cdd16d73d4d6944de6c5ddfd7
Cr-Commit-Position: refs/heads/master@{#417775}
==========

[commit-bot: I haz the power, 2016-09-10 00:24:02]

Patchset 3 (id:??) landed as
https://crrev.com/64a061448438227cdd16d73d4d6944de6c5ddfd7
Cr-Commit-Position: refs/heads/master@{#417775}