[Android History] Add Android history manager UI and bridge

chrome/android/java/src/org/chromium/chrome/browser/history/HistoryItem.java

+// Copyright 2016 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.history;
+
+import android.text.TextUtils;
+
+import org.chromium.chrome.browser.widget.DateDividedAdapter.TimedItem;
+
+/** Contains information about a single browsing history item. */
+public class HistoryItem extends TimedItem {
+    private String mUrl;

[gone, 2016/12/02 19:34:37]

Can any of these things be final?

[Theresa, 2016/12/02 20:49:32]

Done.

+    private String mDomain;
+    private String mTitle;
+    private long mTimestamp;
+    private Long mStableId;
+
+    /**
+     * @param url The url for this item.
+     * @param domain The string to display for the item's domain.
+     * @param title The string to display for the item's title.
+     * @param timestamp The timestamp for this item.
+     */
+    public HistoryItem(String url, String domain, String title, long timestamp) {
+        mUrl = url;
+        mDomain = domain;
+        mTitle = TextUtils.isEmpty(title) ? url : title;
+        mTimestamp = timestamp;
+    }
+
+    /** @return The string to display for the item's domain. */
+    public String getDomain() {
+        return mDomain;
+    }
+
+    /** @return The string to display for the item's title. */
+    public String getTitle() {
+        return mTitle;
+    }
+
+    @Override
+    public long getTimestamp() {
+        return mTimestamp;
+    }
+
+    @Override
+    public long getStableId() {
+        if (mStableId == null) {
+            // Generate a stable ID that combines the timestamp and the URL.
+            mStableId = (long) mUrl.hashCode();
+            mStableId = (mStableId << 32) + (getTimestamp() & 0x0FFFFFFFF);
+        }
+        return mStableId;
+    }
+}