Allow origin trials to be enabled by script

third_party/WebKit/LayoutTests/http/tests/origin_trials/webexposed/resources/foreignfetch-origin-trial-interfaces-worker.php

Index: third_party/WebKit/LayoutTests/http/tests/origin_trials/webexposed/resources/foreignfetch-origin-trial-interfaces-worker.php
diff --git a/third_party/WebKit/LayoutTests/http/tests/origin_trials/webexposed/resources/foreignfetch-origin-trial-interfaces-worker.php b/third_party/WebKit/LayoutTests/http/tests/origin_trials/webexposed/resources/foreignfetch-origin-trial-interfaces-worker.php
new file mode 100644
index 0000000000000000000000000000000000000000..8031fc665cffd4930592bc4af228a93052ed5f6a
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/http/tests/origin_trials/webexposed/resources/foreignfetch-origin-trial-interfaces-worker.php
@@ -0,0 +1,21 @@
+<?php
+if (isset($_GET["origintrial"])) {
+  // Generate token with the command:
+  // generate_token.py  http://127.0.0.1:8000 ForeignFetch -expire-timestamp=2000000000
+  header("Origin-Trial: AinuK1QNcHGJANXfN0Pzkvpxm8rocd4kcqQqhp7rBN8PEX/1JicCoDXX3fIhk7iwBOCCOQYR0cvZ8XHTLJJfVw0AAABUeyJvcmlnaW4iOiAiaHR0cDovLzEyNy4wLjAuMTo4MDAwIiwgImZlYXR1cmUiOiAiRm9yZWlnbkZldGNoIiwgImV4cGlyeSI6IDIwMDAwMDAwMDB9");
+}
+header('Content-Type: application/javascript');
+?>
+importScripts('../../../resources/origin-trials-helper.js');
+
+self.addEventListener('message', event => {
+    event.source.postMessage(
+        OriginTrialsHelper.get_interface_names(
+            this,
+            ['ForeignFetchEvent',
+             'InstallEvent',
+             'global'
+            ],
+            {'InstallEvent':['registerForeignFetch'],
+             'global':['onforeignfetch']}));
+  });