add pan-x and pan-y support to CSS touch-action parsing.

LayoutTests/fast/css/touch-action-parsing.html

Index: LayoutTests/fast/css/touch-action-parsing.html
diff --git a/LayoutTests/fast/css/touch-action-parsing.html b/LayoutTests/fast/css/touch-action-parsing.html
old mode 100644
new mode 100755
index 41037807204d837010682711a29330aafc73754b..817b49b081fb6022eeff2585ffa73579cbe7cd82
--- a/LayoutTests/fast/css/touch-action-parsing.html
+++ b/LayoutTests/fast/css/touch-action-parsing.html
@@ -17,8 +17,15 @@
 <div class="test" id="default" expected="auto"></div>
 <div class="test defnone" id="stylesheet-none" expected="none"></div>
 <div class="test defnone" id="explicit-auto" style="touch-action: auto;" expected="auto"></div>
+<div class="test" id="explicit-pan-x" style="touch-action: pan-x;" expected="pan-x"></div>
+<div class="test" id="explicit-pan-y" style="touch-action: pan-y;" expected="pan-y"></div>
+<div class="test" id="explicit-pan-x-pan-y" style="touch-action: pan-x pan-y;" expected="pan-x pan-y"></div>
+<div class="test" id="explicit-pan-y-pan-x" style="touch-action: pan-y pan-x;" expected="pan-x pan-y"></div>
 <div class="test" id="explicit-none" style="touch-action: none;" expected="none"></div>
-<div class="test" id="explicit-invalid" style="touch-action: bogus;" expected="auto"></div>
+<div class="test" id="explicit-invalid-1" style="touch-action: bogus;" expected="auto"></div>
+<div class="test defnone" id="explicit-invalid-2" style="touch-action: auto pan-x;" expected="none"></div>
+<div class="test" id="explicit-invalid-3" style="touch-action: pan-y none;" expected="auto"></div>
+<div class="test" id="explicit-invalid-4" style="touch-action: pan-x pan-x;" expected="auto"></div>
 <div style="touch-action: none;">
   <div class="test" id="not-inherited" expected="auto"></div>
   <div class="test" id="inherit" style="touch-action: inherit;" expected="none"></div>