Add timestamp support to the Previews infobar

chrome/android/java/src/org/chromium/chrome/browser/infobar/PreviewsInfoBar.java

+// Copyright 2017 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.
+
+package org.chromium.chrome.browser.infobar;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.chrome.browser.ResourceId;
+
+/**
+ * An InfoBar that lets the user know that a Preview page has been loaded, and gives the user
+ * a link to reload the original page. This InfoBar will only be shown once per page load.
+ */
+public class PreviewsInfoBar extends ConfirmInfoBar {
+    private final String mTimestampText;
+
+    @CalledByNative
+    private static InfoBar show(
+            int enumeratedIconId, String message, String linkText, String timestampText) {
+        return new PreviewsInfoBar(
+                ResourceId.mapToDrawableId(enumeratedIconId), message, linkText, timestampText);
+    }
+
+    private PreviewsInfoBar(
+            int iconDrawbleId, String message, String linkText, String timestampText) {
+        super(iconDrawbleId, null, message, linkText, null, null);
+        mTimestampText = timestampText;
+    }
+
+    @Override
+    public void createContent(InfoBarLayout layout) {
+        super.createContent(layout);
+        if (mTimestampText.isEmpty()) return;
+        layout.getMessageLayout().addDescription(mTimestampText);
+    }
+}