Restructure type tracking in StyleValues to work better with new numeric types

third_party/WebKit/LayoutTests/typedcssom/inlinestyle/properties/property-suite.js

 /**
  * A standard set of tests for using a single property in an
  *     inline StylePropertyMap
  *     (https://www.w3.org/TR/css-typed-om-1/#the-stylepropertymap).
  *
  * Create a config object containing {
  *   validKeywords: array of strings,
  *   validObjects: array of CSSStyleValue instances that are valid for the
  *       property,
  *   validStringMappings: object containing a mapping of string to
@@ skipping 85 matching lines @@
       // Force a style recalc to check for crashes in style recalculation.
       getComputedStyle(element)[propertyName];
       assert_equals(element.style[propertyName], validObject.toString());
     }, 'Setting ' + propertyName + ' to ' + validObject.constructor.name +
         ' with value ' +  validObject.toString());
   }
 
   // Negative tests
   for (let invalidObject of invalidObjects) {
     let name = invalidObject instanceof CSSStyleValue ?
-        invalidObject.constructor.name : invalidObject;
+        invalidObject.constructor.name + ' "' + invalidObject.toString() + '"' :
+        invalidObject;
     test(function() {
       assert_throws(new TypeError(), function() {
         element.styleMap.set(propertyName, invalidObject);
       });
     }, 'Setting ' + propertyName + ' to invalid value ' + name + ' throws');
   }
 }
 
 function runGetterTests(
     propertyName, validKeywords, validObjects, validStringMappings, element) {
@@ skipping 172 matching lines @@
   }, 'Setting ' + propertyName + ' to a sequence throws');
 
   test(function() {
     element.style = '';
     assert_throws(new TypeError(), function() {
       element.styleMap.append(propertyName, validObject);
     });
   }, 'Appending to ' + propertyName + ' throws');
 }