Implement specced parsing algorithm for <area coords>

Implement specced parsing algorithm for <area coords>

This implements the parsing algorithm for "list of floating point
numbers" and uses it to parse the 'coords' attribute on <area>.
The fractional part of numbers are no longer discarded.
The old parsing code in platform/Length.cpp is no longer used and is
removed.

BUG=578114
Committed: https://crrev.com/1d6711a6b110f354e90ee7a481323b54c7655b2d
Cr-Commit-Position: refs/heads/master@{#371940}

[fs, 2016-01-27 14:24:23]

fs@opera.com changed reviewers:
+ tkent@chromium.org

[tkent, 2016-01-28 00:29:36]

The CQ bit was checked by tkent@chromium.org

[tkent, 2016-01-28 00:29:37]

lgtm

[commit-bot: I haz the power, 2016-01-28 00:29:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1636333003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1636333003/1

[commit-bot: I haz the power, 2016-01-28 00:39:27]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-28 00:41:31]

Description was changed from

==========
Implement specced parsing algorithm for <area coords>

This implements the parsing algorithm for "list of floating point
numbers" and uses it to parse the 'coords' attribute on <area>.
The fractional part of numbers are no longer discarded.
The old parsing code in platform/Length.cpp is no longer used and is
removed.

BUG=578114
==========

to

==========
Implement specced parsing algorithm for <area coords>

This implements the parsing algorithm for "list of floating point
numbers" and uses it to parse the 'coords' attribute on <area>.
The fractional part of numbers are no longer discarded.
The old parsing code in platform/Length.cpp is no longer used and is
removed.

BUG=578114

Committed: https://crrev.com/1d6711a6b110f354e90ee7a481323b54c7655b2d
Cr-Commit-Position: refs/heads/master@{#371940}
==========

[commit-bot: I haz the power, 2016-01-28 00:41:31]

Patchset 1 (id:??) landed as
https://crrev.com/1d6711a6b110f354e90ee7a481323b54c7655b2d
Cr-Commit-Position: refs/heads/master@{#371940}