[CherryPick] flex-grow should be 1 when flex:auto

[CherryPick] flex-grow should be 1 when flex:auto

[Title] [CherryPick] flex-grow should be 1 when flex:auto
[Issue] TWEB-1141
[Problem] 'flex:auto' is equivalent to 'flex: 1 1 auto' but got 'fiex: 0 1 auto'
[Cause] The flex-grow value was set to 0 when 'flex:auto'. It should be 1.
[Solution] Cherry-pick the opensource patch.
[Cherry-Picker] KyungTae Kim <ktf.kim@samsung.com>

flex-grow should be 1 when omitted from flex shorthand
https://bugs.webkit.org/show_bug.cgi?id=97480

Reviewed by Ojan Vafai.

Source/WebCore:

We were using 0, based on an outdated version of the spec.

Tests: css3/flexbox/flex-property-parsing.html
       css3/flexbox/flex-algorithm.html: New test case.

* css/CSSParser.cpp:
(WebCore::CSSParser::parseFlex):

LayoutTests:

Update tests due to default CSS value changes.

* css3/flexbox/flex-algorithm-expected.txt:
* css3/flexbox/flex-algorithm.html: Add test case using -webkit-flex: auto.
* css3/flexbox/flex-property-parsing-expected.txt:
* css3/flexbox/flex-property-parsing.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@129414 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Conflicts:

	LayoutTests/ChangeLog
	Source/WebCore/ChangeLog

Change-Id: I9085db2b10a723c8a1efd3050f2087ab7e8751cd