add 'manipulation' support to CSS touch-action parsing.

Source/web/tests/data/touch-action-tests.css

Index: Source/web/tests/data/touch-action-tests.css
diff --git a/Source/web/tests/data/touch-action-tests.css b/Source/web/tests/data/touch-action-tests.css
index b945ac35669cdbc2de1f059da8816c247d84b537..f7b41a5f71141c6c814120dcedb40740b49954ff 100644
--- a/Source/web/tests/data/touch-action-tests.css
+++ b/Source/web/tests/data/touch-action-tests.css
@@ -23,6 +23,11 @@
   touch-action: pan-x pan-y;
 }
 
+.ta-manipulation {
+  -ms-touch-action: manipulation;
+  touch-action: manipulation;
+}
+
 /* Make it easy to visualize div boundaries */
 [expected-action] {
   margin: 15px;
@@ -46,6 +51,9 @@
 [expected-action=pan-x-y]::before {
   content: "PAN-X PAN-Y \2190 ";
 }
+[expected-action=manipulation]::before {
+  content: "MANIPULATION \2190 ";
+}
 
 body {
   /* Leave gap for test to scroll down */