Source/WebCore: getComputedStyle should return shorthands property with the minimum...

Source/WebCore: getComputedStyle should return shorthands property with the minimum number of sides possible.
https://bugs.webkit.org/show_bug.cgi?id=75434

Reviewed by Tony Chang.

As stated in http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSS2Properties we should
return shorthands properties with the minimum number of sides possible.

Existing tests have been updated accordingly.

* css/CSSComputedStyleDeclaration.cpp:
(WebCore::CSSComputedStyleDeclaration::getPropertyCSSValue):
(WebCore::CSSComputedStyleDeclaration::getCSSPropertyValuesForSidesShorthand):
* css/CSSComputedStyleDeclaration.h:

LayoutTests: getComputedStyle should return shorthands properties with the minimum number of sides possible.
https://bugs.webkit.org/show_bug.cgi?id=75434

Reviewed by Tony Chang.

As stated in http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSS2Properties we should
return shorthands properties with the minimum number of sides possible.

* fast/css/getComputedStyle/getComputedStyle-border-color-shorthand-expected.txt:
* fast/css/getComputedStyle/getComputedStyle-border-color-shorthand.html:
* fast/css/getComputedStyle/getComputedStyle-border-style-shorthand-expected.txt:
* fast/css/getComputedStyle/getComputedStyle-border-style-shorthand.html:
* fast/css/getComputedStyle/getComputedStyle-border-width-expected.txt:
* fast/css/getComputedStyle/getComputedStyle-border-width.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@103953 268f45cc-cd09-0410-ab3c-d52691b4dbfc