📰 Do not refresh Tiles while visible

chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageView.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageView.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageView.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageView.java
index 6317e6e0a463903d322b3520c44361c8c4a1e5b9..c833e891153f96956274def1610a2c790249cd9e 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageView.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageView.java
@@ -44,6 +44,7 @@
 import org.chromium.chrome.browser.suggestions.Tile;
 import org.chromium.chrome.browser.suggestions.TileGridLayout;
 import org.chromium.chrome.browser.suggestions.TileGroup;
+import org.chromium.chrome.browser.tab.EmptyTabObserver;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.util.FeatureUtilities;
 import org.chromium.chrome.browser.util.MathUtils;
@@ -235,6 +236,12 @@ public void onDestroy() {
         mNewTabPageLayout.addOnLayoutChangeListener(this);
         setSearchProviderHasLogo(searchProviderHasLogo);
 
+        tab.addObserver(new EmptyTabObserver() {
+            @Override
+            public void onShown(Tab tab) {
+                mTileGroup.onSwitchToForeground();
+            }
+        });
         mTileGroup.startObserving(getMaxTileRows(searchProviderHasLogo) * getMaxTileColumns());
 
         // Set up snippets
@@ -417,6 +424,11 @@ public View getPlaceholder() {
         return mTileGridPlaceholder;
     }
 
+    @VisibleForTesting
+    public TileGroup getTileGroup() {
+        return mTileGroup;
+    }
+
     /**
      * Adds listeners to scrolling to take care of snap scrolling and updating the search box on
      * scroll.