Bug 1745059 [wpt PR 31965] - URLPattern: Escape some suffixes trailing `:foo` groups., a=testonly

Automatic update from web-platform-tests
URLPattern: Escape some suffixes trailing `:foo` groups.

This CL fixes another problem case from:

https://github.com/WICG/urlpattern/issues/145

In this case we need to detect when a group suffix could be mistaken
for trailing custom name characters.  When this happens we should escape
the first character of the suffix.  For example: `{:foo\\bar}` instead
of `{:foobar}`.

Bug: 1263673
Change-Id: I2aa2d043ef4c71433fdc0be113fcafddf5ad3532
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3318605
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Ben Kelly <wanderview@chromium.org>
Cr-Commit-Position: refs/heads/main@{#949707}

--

wpt-commits: 73d24b5e86feab550aa5ab7271a814aaa5882cf7
wpt-pr: 31965

testing/web-platform/tests/urlpattern/resources/urlpatterntestdata.json

@@ -2541,5 +2541,29 @@
     "expected_match": {
       "pathname": { "input": "foobarbaz", "groups": { "foo": "f", "0": "oobarbaz" }}
     }
+  },
+  {
+    "pattern": [{ "pathname": "{:foo\\bar}" }],
+    "inputs": [{ "pathname": "foobar" }],
+    "expected_match": {
+      "pathname": { "input": "foobar", "groups": { "foo": "foo" }}
+    }
+  },
+  {
+    "pattern": [{ "pathname": "{:foo\\.bar}" }],
+    "inputs": [{ "pathname": "foo.bar" }],
+    "expected_obj": {
+      "pathname": "{:foo.bar}"
+    },
+    "expected_match": {
+      "pathname": { "input": "foo.bar", "groups": { "foo": "foo" }}
+    }
+  },
+  {
+    "pattern": [{ "pathname": "{:foo(foo)bar}" }],
+    "inputs": [{ "pathname": "foobar" }],
+    "expected_match": {
+      "pathname": { "input": "foobar", "groups": { "foo": "foo" }}
+    }
   }
 ]