Add URL recipe module from "depot_tools".

recipe_modules/url/tests/join.expected/basic.json

Index: recipe_modules/url/tests/join.expected/basic.json
diff --git a/recipe_modules/url/tests/join.expected/basic.json b/recipe_modules/url/tests/join.expected/basic.json
new file mode 100644
index 0000000000000000000000000000000000000000..e17e15b7ce18d832ad55bb467ae89c1d44d0d95e
--- /dev/null
+++ b/recipe_modules/url/tests/join.expected/basic.json
@@ -0,0 +1,35 @@
+[
+  {
+    "cmd": [
+      "/bin/echo",
+      "foo/bar/baz"
+    ],
+    "name": "step1"
+  },
+  {
+    "cmd": [
+      "/bin/echo",
+      "foo/bar/baz"
+    ],
+    "name": "step2"
+  },
+  {
+    "cmd": [
+      "/bin/echo",
+      "foo/bar/baz//"
+    ],
+    "name": "step3"
+  },
+  {
+    "cmd": [
+      "/bin/echo",
+      "foo/bar/baz//"
+    ],
+    "name": "step4"
+  },
+  {
+    "name": "$result",
+    "recipe_result": null,
+    "status_code": 0
+  }
+]