[css3-text] Implement text-decoration property shorthand

LayoutTests/editing/style/inline-style-container-expected.txt

Index: LayoutTests/editing/style/inline-style-container-expected.txt
diff --git a/LayoutTests/editing/style/inline-style-container-expected.txt b/LayoutTests/editing/style/inline-style-container-expected.txt
index 12dce2e0d30da5be648a6873d399fc7a50700f19..9f5720a28099c280204afab6c49519f76b2ac8e2 100644
--- a/LayoutTests/editing/style/inline-style-container-expected.txt
+++ b/LayoutTests/editing/style/inline-style-container-expected.txt
@@ -29,8 +29,8 @@ PASS fontSize(4) on all of "<i><b>hello</b></i>" yields "<i><b style="font-size:
 PASS fontSize(4) on all of "<i><b>hello</b> world</i>" yields "<i style="font-size: large;"><b>hello</b> world</i>"
 PASS fontSize(4) on all of "<font color="blue"><b>hello</b></font>" yields "<font color="blue"><b style="font-size: large;">hello</b></font>"
 PASS bold(null) on all of "<span style="font-style: italic;">hello</span>" yields "<span style="font-style: italic; font-weight: bold;">hello</span>"
-PASS underline(null) on all of "<span style="font-style: italic;"><b>hello</b></span>" yields "<span style="font-style: italic; text-decoration: underline;"><b>hello</b></span>"
-PASS underline(null) on all of "<span style="color: blue;"><i><span style="font-size: large;"><b>hello</b> world</span></i></span>" yields "<span style="color: blue;"><i><span style="font-size: large; text-decoration: underline;"><b>hello</b> world</span></i></span>"
+PASS underline(null) on all of "<span style="font-style: italic;"><b>hello</b></span>" yields "<span style="font-style: italic; text-decoration-line: underline;"><b>hello</b></span>"
+PASS underline(null) on all of "<span style="color: blue;"><i><span style="font-size: large;"><b>hello</b> world</span></i></span>" yields "<span style="color: blue;"><i><span style="font-size: large; text-decoration-line: underline;"><b>hello</b> world</span></i></span>"
 PASS successfullyParsed is true
 
 TEST COMPLETE