Fix idlharness.js' handling of Float(32/64)Array types

idlharness.js does not seem to correctly handle Float32Array and
Float64Array types. When an interface uses such types, the tests will
fail with the exception thrown from idlharness.js:1221:
`throw new IdlHarnessError("Unrecognized type " + type);`

The fix is to teach idlharness.js how to handle Float(32/64)Array types,
and, while at it, to teach it to handle other typed arrays.

Bug: 1074548
Change-Id: I549f6ae1ea13590207bd4f49b94439ad2a43a13d

resources/idlharness.js

@@ -679,6 +679,7 @@ IdlArray.prototype.is_json_type = function(type)
        case "Uint32Array":
        case "Uint8ClampedArray":
        case "Float32Array":
+       case "Float64Array":
        case "ArrayBuffer":
        case "DataView":
        case "any":
@@ -1207,8 +1208,18 @@ IdlArray.prototype.assert_type_is = function(value, type)
             assert_regexp_match(value, /^([\x00-\ud7ff\ue000-\uffff]|[\ud800-\udbff][\udc00-\udfff])*$/);
             return;
 
+        case "Int8Array":
+        case "Int16Array":
+        case "Int32Array":
+        case "Uint8Array":
+        case "Uint16Array":
+        case "Uint32Array":
+        case "Uint8ClampedArray":
+        case "Float32Array":
+        case "Float64Array":
+        case "ArrayBuffer":
         case "DataView":
-            assert_equals(typeof value, "DataView");
+            assert_true(value instanceof self[type], "wrong type: not a " + type);
             return;
 
         case "object":