Update web-platform-tests to revision 7a6f5673ff5d146ca5c09c6a1b42b7706cfee328

tests/wpt/web-platform-tests/docs/_writing-tests/assumptions.md

@@ -16,8 +16,13 @@ tests can freely rely on these assumptions being true:
  * The user stylesheet is empty (except where indicated by the tests).
  * The device is interactive and uses scroll bars.
  * The device has the Ahem font installed.
- * The HTML `div` element is assigned `display: block;` and no other
-   property declaration.
+ * The HTML `div` element is assigned `display: block;`, the
+   `unicode-bidi` property may be declared, and no other property
+   declarations.
+   <!-- unicode-bidi: isolate should be required; we currently don't
+   assume this because Chrome and Safari are yet to ship this: see
+   https://bugs.chromium.org/p/chromium/issues/detail?id=296863 and
+   https://bugs.webkit.org/show_bug.cgi?id=65617 -->
  * The HTML `span` element is assigned `display: inline;` and no other
    property declaration.
  * The HTML `p` element is assigned `display: block;`

tests/wpt/web-platform-tests/docs/_writing-tests/testharness-api.md

@@ -700,6 +700,11 @@ Relies on `===`, distinguishes between `-0` and `+0`, and has a specific check f
 asserts that `expected` is an Array, and `actual` is equal to one of the
 members i.e. `expected.indexOf(actual) != -1`
 
+### `assert_object_equals(actual, expected, description)`
+asserts that `actual` is an object and not null and that all enumerable
+properties on `actual` are own properties on `expected` with the same values,
+recursing if the value is an object and not null.
+
 ### `assert_array_equals(actual, expected, description)`
 asserts that `actual` and `expected` have the same
 length and the value of each indexed property in `actual` is the strictly equal