[DeviceService] Replace vibration_browsertest.cc with layout tests.

third_party/WebKit/LayoutTests/vibration/resources/vibration-helpers.js

+'use strict';
+
+function vibration_mocks(mojo) {
+  return define('VibrationManager mocks', [
+    'mojo/public/js/bindings',
+    'device/vibration/vibration_manager.mojom',
+  ], (bindings, vibrationManager) => {
+    class MockVibrationManager {
+      constructor() {
+        this.bindingSet = new bindings.BindingSet(vibrationManager.VibrationManager);
+
+        this.vibrate_milliseconds_ = -1;
+        this.cancelled_ = false;
+      }
+
+      vibrate(milliseconds) {
+        this.vibrate_milliseconds_ = milliseconds;
+        window.postMessage(milliseconds, '*');

[leonhsl(Using Gerrit), 2017/03/07 15:00:41]

I'm not sure whether this is the best practice to notify that mojo function got
called, in layout tests.

+        return Promise.resolve();
+      }
+
+      cancel() {
+        this.cancelled_ = true;
+      }
+
+      getDuration() {
+        return this.vibrate_milliseconds_;
+      }
+
+      isCancelled() {
+        return this.cancelled_;
+      }
+
+      reset() {
+        this.vibrate_milliseconds_ = -1;
+        this.cancelled_ = false;
+      }
+    }
+
+    let mockVibrationManager = new MockVibrationManager;
+    mojo.frameInterfaces.addInterfaceOverrideForTesting(
+        vibrationManager.VibrationManager.name,
+        handle => {
+          mockVibrationManager.bindingSet.addBinding(mockVibrationManager, handle);
+        });
+
+    return Promise.resolve({
+      // Interface instance bound to main frame.
+      mockVibrationManager: mockVibrationManager,
+      // Constructor for mock VibrationManager class.
+      MockVibrationManager: MockVibrationManager,
+      // Loaded mojom interface.
+      VibrationManager: vibrationManager.VibrationManager,
+    });
+  });
+}
+
+function vibration_test(func, name, properties) {
+  mojo_test(mojo => vibration_mocks(mojo).then(vibration => {
+    let result = Promise.resolve(func(vibration));
+    let cleanUp = () => vibration.mockVibrationManager.reset();
+    result.then(cleanUp, cleanUp);
+    return result;
+  }), name, properties);
+}