[Downloads] Consolidate Java DownloadItem/Info creation

chrome/android/java/src/org/chromium/chrome/browser/download/DownloadItem.java

Index: chrome/android/java/src/org/chromium/chrome/browser/download/DownloadItem.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadItem.java b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadItem.java
index fb0168d073812f726be6f08d9cd41c42b28c094c..c8e3b8e7834f59eecf9bc047854521ed9cb33fe1 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadItem.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadItem.java
@@ -4,6 +4,8 @@
 
 package org.chromium.chrome.browser.download;
 
+import org.chromium.base.annotations.CalledByNative;
+
 /**
  * A generic class representing a download item. The item can be either downloaded through the
  * Android DownloadManager, or through Chrome's network stack.
@@ -110,4 +112,13 @@ public class DownloadItem {
     public boolean hasBeenExternallyRemoved() {
         return mHasBeenExternallyRemoved;
     }
+
+    @CalledByNative
+    private static DownloadItem createDownloadItem(
+            DownloadInfo downloadInfo, long startTimestamp, boolean hasBeenExternallyRemoved) {
+        DownloadItem downloadItem = new DownloadItem(false, downloadInfo);
+        downloadItem.setStartTime(startTimestamp);
+        downloadItem.setHasBeenExternallyRemoved(hasBeenExternallyRemoved);
+        return downloadItem;
+    }
 }