📰 Ensure NTP Tiles keep tracking recent data

chrome/android/java/src/org/chromium/chrome/browser/suggestions/Tile.java

Index: chrome/android/java/src/org/chromium/chrome/browser/suggestions/Tile.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/suggestions/Tile.java b/chrome/android/java/src/org/chromium/chrome/browser/suggestions/Tile.java
index 48a9d3a5bdac0f8fd21fdbaff5ab959bf6411198..6b9e3bffcb776cf5db7abf06efada42385d92464 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/suggestions/Tile.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/suggestions/Tile.java
@@ -50,6 +50,31 @@ public Tile(String title, String url, String whitelistIconPath, boolean offlineA
     }
 
     /**
+     * Imports transient data from an old tile, and reports whether there is a significant
+     * difference between the two that would require a redraw.
+     * Assumes that the current tile and the old tile (if provided) both describe the same site,
+     * so the URLs have to be the same.
+     */
+    public boolean importData(@Nullable Tile tile) {
+        if (tile == null) return true;
+
+        assert tile.getUrl().equals(mUrl);
+
+        mType = tile.getType();
+        mIcon = tile.getIcon();
+
+        if (!tile.getTitle().equals(mTitle)) return true;
+        if (tile.isOfflineAvailable() != mOfflineAvailable) return true;
+        if (tile.getIndex() != mIndex) return true;
+
+        // Ignore the whitelist changes when we already have an icon, since we won't need to reload
+        // it. We also omit requesting a redraw when |mSource| changes, as it only affects UMA.
+        if (!tile.getWhitelistIconPath().equals(mWhitelistIconPath) && mIcon == null) return true;
+
+        return false;
+    }
+
+    /**
      * @return The site URL of this tile.
      */
     public String getUrl() {