1 files changed, 75 insertions, 0 deletions
diff --git a/chromium/chrome/browser/resources/welcome/onboarding_welcome/landing_view_proxy.js b/chromium/chrome/browser/resources/welcome/onboarding_welcome/landing_view_proxy.js
new file mode 100644
index 00000000000..50d9fc06073
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+++ b/chromium/chrome/browser/resources/welcome/onboarding_welcome/landing_view_proxy.js
@@ -0,0 +1,75 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+cr.define('nux', function() {
+  const NUX_LANDING_PAGE_INTERACTION_METRIC_NAME =
+      'FirstRun.NewUserExperience.LandingPageInteraction';
+
+  /**
+   * NuxLandingPageInteractions enum.
+   * These values are persisted to logs and should not be renumbered or re-used.
+   * See tools/metrics/histograms/enums.xml.
+   * @enum {number}
+   */
+  const NuxLandingPageInteractions = {
+    PageShown: 0,
+    NavigatedAway: 1,
+    NewUser: 2,
+    ExistingUser: 3,
+  };
+
+  const NUX_LANDING_PAGE_INTERACTIONS_COUNT =
+      Object.keys(NuxLandingPageInteractions).length;
+
+  /** @interface */
+  class LandingViewProxy {
+    recordPageShown() {}
+
+    recordNavigatedAway() {}
+
+    recordNewUser() {}
+
+    recordExistingUser() {}
+  }
+
+  /** @implements {nux.LandingViewProxy} */
+  class LandingViewProxyImpl {
+    /** @override */
+    recordPageShown() {
+      this.recordInteraction_(NuxLandingPageInteractions.PageShown);
+    }
+
+    /** @override */
+    recordNavigatedAway() {
+      this.recordInteraction_(NuxLandingPageInteractions.NavigatedAway);
+    }
+
+    /** @override */
+    recordNewUser() {
+      this.recordInteraction_(NuxLandingPageInteractions.NewUser);
+    }
+
+    /** @override */
+    recordExistingUser() {
+      this.recordInteraction_(NuxLandingPageInteractions.ExistingUser);
+    }
+
+    /**
+     * @param {number} interaction
+     * @private
+     */
+    recordInteraction_(interaction) {
+      chrome.metricsPrivate.recordEnumerationValue(
+          NUX_LANDING_PAGE_INTERACTION_METRIC_NAME, interaction,
+          NUX_LANDING_PAGE_INTERACTIONS_COUNT);
+    }
+  }
+
+  cr.addSingletonGetter(LandingViewProxyImpl);
+
+  return {
+    LandingViewProxy: LandingViewProxy,
+    LandingViewProxyImpl: LandingViewProxyImpl,
+  };
+});