Adding status info to DownloadUIItem and piping it through.

chrome/android/java/src/org/chromium/chrome/browser/offlinepages/downloads/OfflinePageDownloadItem.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.offlinepages.downloads;
 
+import org.chromium.components.offlinepages.downloads.DownloadState;
+
 /** Class representing offline page or save page request to downloads UI. */
 public class OfflinePageDownloadItem {
     private final String mUrl;
+    private final int mDownloadState;
+    private final long mDownloadProgressBytes;
     private final String mTitle;
     private final String mGuid;
     private final String mTargetPath;
     private final long mStartTimeMs;
     private final long mTotalBytes;
 
-    public OfflinePageDownloadItem(
-            String guid, String url, String title, String targetPath,
+    public OfflinePageDownloadItem(String guid, String url, int downloadState,
+            long downloadProgressBytes, String title, String targetPath,
             long startTimeMs, long totalBytes) {
         mGuid = guid;
         mUrl = url;
+        mDownloadState = downloadState;
+        mDownloadProgressBytes = downloadProgressBytes;
         mTitle = title;
         mTargetPath = targetPath;
         mStartTimeMs = startTimeMs;
         mTotalBytes = totalBytes;
     }
 
     /** @return GUID identifying the item. */
     public String getGuid() {
         return mGuid;
     }
 
     /** @return URL related to the item. */
     public String getUrl() {
         return mUrl;
     }
 
+    /** @return DownloadState value. */
+    public int getDownloadState() {
+        return mDownloadState;
+    }
+
+    /** @return current download progress while the item is downloaded.

[gone, 2017/02/09 23:56:57]

If it doesn't fit on one line, /** sits on a line by itself

[Dmitry Titov, 2017/02/10 02:04:39]

Done.

+        Returns 0 if the item is not currently downloading. */
+    public long getDownloadProgressBytes() {
+        if (mDownloadState != DownloadState.IN_PROGRESS) return 0;
+        return mDownloadProgressBytes;
+    }
+
     /** @return Title of the page. */
     public String getTitle() {
         return mTitle;
     }
 
     /** @return Path to the offline item on the disk. */
     // TODO(fgorski): Title would be more meaningful to show in the Download UI, where the local
     // path is shown right now.
     public String getTargetPath() {
         return mTargetPath;
     }
 
     /** @return Start time of the item, corresponding to when the offline page was saved. */
     public long getStartTimeMs() {
         return mStartTimeMs;
     }
 
     /** @return Size of the offline archive in bytes. */
     public long getTotalBytes() {
         return mTotalBytes;
     }
 }