[css-grid] Rename GridCoordinate to GridArea

[css-grid] Rename GridCoordinate to GridArea

As the comment in GridCoordinate says,
it actually represents a grid area as it stores
the initial and final positions in both axis (columns and rows).

Someone can think about a grid coordinate just like a single cell.
However this class was representing an area of several cells.

On top of that the "grid area" concept is defined in the spec:
https://drafts.csswg.org/css-grid/#grid-area-concept

No new tests, no change of behavior.

BUG=444011
Committed: https://crrev.com/d2b19519116145ad2e1baa24a3965726dc0eabc6
Cr-Commit-Position: refs/heads/master@{#372638}

[Manuel Rego, 2016-01-29 16:07:33]

rego@igalia.com changed reviewers:
+ rune@opera.com, svillar@igalia.com, timloh@chromium.org

[Manuel Rego, 2016-01-29 16:07:34]

Another small refactoring on grid placement code.

[rune, 2016-02-01 09:44:58]

lgtm

[Manuel Rego, 2016-02-01 10:03:21]

The CQ bit was checked by rego@igalia.com

[commit-bot: I haz the power, 2016-02-01 10:04:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1648333002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1648333002/1

[commit-bot: I haz the power, 2016-02-01 11:21:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-01 11:23:03]

Description was changed from

==========
[css-grid] Rename GridCoordinate to GridArea

As the comment in GridCoordinate says,
it actually represents a grid area as it stores
the initial and final positions in both axis (columns and rows).

Someone can think about a grid coordinate just like a single cell.
However this class was representing an area of several cells.

On top of that the "grid area" concept is defined in the spec:
https://drafts.csswg.org/css-grid/#grid-area-concept

No new tests, no change of behavior.

BUG=444011
==========

to

==========
[css-grid] Rename GridCoordinate to GridArea

As the comment in GridCoordinate says,
it actually represents a grid area as it stores
the initial and final positions in both axis (columns and rows).

Someone can think about a grid coordinate just like a single cell.
However this class was representing an area of several cells.

On top of that the "grid area" concept is defined in the spec:
https://drafts.csswg.org/css-grid/#grid-area-concept

No new tests, no change of behavior.

BUG=444011

Committed: https://crrev.com/d2b19519116145ad2e1baa24a3965726dc0eabc6
Cr-Commit-Position: refs/heads/master@{#372638}
==========

[commit-bot: I haz the power, 2016-02-01 11:23:04]

Patchset 1 (id:??) landed as
https://crrev.com/d2b19519116145ad2e1baa24a3965726dc0eabc6
Cr-Commit-Position: refs/heads/master@{#372638}