Allow Downloads Home v2 RecyclerView to reuse holders

It turns out that only setting the change animation duration to 0
doesn't tell the default ItemAnimator that it can reuse ViewHolders.
This is because it still attempts to animate between the old and new
ViewHolder Views.  Setting a payload seems to bypass this as well
though.

This patch disables change animations completely for the Download Home
v2 RecyclerView ItemAnimator.

Change-Id: I633b6408a73c55da26a608d07ec564bf82737ee5
Reviewed-on: https://chromium-review.googlesource.com/c/1260125Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596727}

chrome/android/java/src/org/chromium/chrome/browser/download/home/list/DateOrderedListView.java

@@ -7,6 +7,7 @@ package org.chromium.chrome.browser.download.home.list;
 import android.content.Context;
 import android.graphics.Rect;
 import android.support.annotation.Nullable;
+import android.support.v7.widget.DefaultItemAnimator;
 import android.support.v7.widget.GridLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.support.v7.widget.RecyclerView.ItemDecoration;
@@ -77,7 +78,7 @@ class DateOrderedListView {
 
         mView = new RecyclerView(context);
         mView.setHasFixedSize(true);
-        mView.getItemAnimator().setChangeDuration(0);
+        ((DefaultItemAnimator) mView.getItemAnimator()).setSupportsChangeAnimations(false);
         mView.getItemAnimator().setMoveDuration(0);
         mView.setLayoutManager(new GridLayoutManagerImpl(context));
         mView.addItemDecoration(new ItemDecorationImpl());