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applyPropertyAll expands all shorthand property to longhand properties,
and apply each longhand property according to all's value (e.g. if
all's value is initial, initial).

Spec: http://dev.w3.org/csswg/css-cascade/#all-shorthand

BUG=172051
TEST=fast/css/all-shorthand.html

Review URL: https://codereview.chromium.org/339163002

git-svn-id: svn://svn.chromium.org/blink/trunk@176396 bbb929c8-8fbe-4397-9dbb-9b2b20218538