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diff --git a/testing/web-platform/tests/resources/chromium/mock-idle-detection.js b/testing/web-platform/tests/resources/chromium/mock-idle-detection.js
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+++ b/testing/web-platform/tests/resources/chromium/mock-idle-detection.js
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+import {IdleManager, IdleManagerError, IdleManagerReceiver} from '/gen/third_party/blink/public/mojom/idle/idle_manager.mojom.m.js';
+
+/**
+ * This is a testing framework that enables us to test the user idle detection
+ * by intercepting the connection between the renderer and the browser and
+ * exposing a mocking API for tests.
+ *
+ * Usage:
+ *
+ * 1) Include <script src="mock.js"></script> in your file.
+ * 2) Set expectations
+ *   expect(addMonitor).andReturn((threshold, monitorPtr, callback) => {
+ *     // mock behavior
+ *   })
+ * 3) Call navigator.idle.query()
+ *
+ * The mocking API is blink agnostic and is designed such that other engines
+ * could implement it too. Here are the symbols that are exposed to tests:
+ *
+ * - function addMonitor(): the main/only function that can be mocked.
+ * - function expect(): the main/only function that enables us to mock it.
+ * - function close(): disconnects the interceptor.
+ * - enum UserIdleState {IDLE, ACTIVE}: blink agnostic constants.
+ * - enum ScreenIdleState {LOCKED, UNLOCKED}: blink agnostic constants.
+ */
+
+class FakeIdleMonitor {
+  addMonitor(threshold, monitorPtr, callback) {
+    return this.handler.addMonitor(threshold, monitorPtr);
+  }
+  setHandler(handler) {
+    this.handler = handler;
+    return this;
+  }
+  setBinding(binding) {
+    this.binding = binding;
+    return this;
+  }
+  close() {
+    this.binding.$.close();
+  }
+}
+
+self.IdleDetectorError = {};
+
+self.addMonitor = function addMonitor(threshold, monitorPtr, callback) {
+  throw new Error("expected to be overriden by tests");
+}
+
+async function close() {
+  interceptor.close();
+}
+
+self.expect = function(call) {
+  return {
+    andReturn(callback) {
+      let handler = {};
+      handler[call.name] = callback;
+      interceptor.setHandler(handler);
+    }
+  };
+};
+
+function intercept() {
+  let result = new FakeIdleMonitor();
+
+  let binding = new IdleManagerReceiver(result);
+  let interceptor = new MojoInterfaceInterceptor(IdleManager.$interfaceName);
+  interceptor.oninterfacerequest = e => binding.$.bindHandle(e.handle);
+  interceptor.start();
+
+  self.IdleDetectorError.SUCCESS = IdleManagerError.kSuccess;
+  self.IdleDetectorError.PERMISSION_DISABLED =
+      IdleManagerError.kPermissionDisabled;
+
+  result.setBinding(binding);
+  return result;
+}
+
+const interceptor = intercept();