Bug 1301305 - Move propertyToIDL to testcommon.js; r=hiro

We would like to use this method in the next patch.

MozReview-Commit-ID: CSdwlVInyds

--HG--
extra : rebase_source : 5e9af4f0ffacaaf08ecee4e6018bed1ee4a74047
extra : histedit_source : b73144f07097982236038c3efb391f6b7d00e5ed

dom/animation/test/mozilla/file_discrete-animations.html

@@ -143,18 +143,6 @@ for (let property in gMozillaSpecificProperties) {
    + from + "' and '" + to + "' with keyframe easing");
 }
 
-function propertyToIDL(property) {
-  var prefixMatch = property.match(/^-(\w+)-/);
-  if (prefixMatch) {
-    var prefix = prefixMatch[1] === "moz" ? "Moz" : prefixMatch[1];
-    property = prefix + property.substring(prefixMatch[0].length - 1);
-  }
-  // https://drafts.csswg.org/cssom/#css-property-to-idl-attribute
-  return property.replace(/-([a-z])/gi, function(str, group) {
-    return group.toUpperCase();
-  });
-}
-
 function testAnimationSamples(animation, idlName, testSamples) {
   const target = animation.effect.target;
   testSamples.forEach(testSample => {

dom/animation/test/testcommon.js

@@ -137,6 +137,22 @@ function addStyle(t, rules) {
   }
 }
 
+/**
+ * Takes a CSS property (e.g. margin-left) and returns the equivalent IDL
+ * name (e.g. marginLeft).
+ */
+function propertyToIDL(property) {
+  var prefixMatch = property.match(/^-(\w+)-/);
+  if (prefixMatch) {
+    var prefix = prefixMatch[1] === 'moz' ? 'Moz' : prefixMatch[1];
+    property = prefix + property.substring(prefixMatch[0].length - 1);
+  }
+  // https://drafts.csswg.org/cssom/#css-property-to-idl-attribute
+  return property.replace(/-([a-z])/gi, function(str, group) {
+    return group.toUpperCase();
+  });
+}
+
 /**
  * Promise wrapper for requestAnimationFrame.
  */
@@ -214,7 +230,7 @@ if (opener) {
 }
 
 /**
- * Return a new MutaionObserver which started observing |target| element
+ * Return a new MutationObserver which started observing |target| element
  * with { animations: true, subtree: |subtree| } option.
  * NOTE: This observer should be used only with takeRecords(). If any of
  * MutationRecords are observed in the callback of the MutationObserver,