Update the sliding prefetch window for tab suggestions from 5s to 30s.

R=davidjm@chromium.org

Change-Id: I86f1d5204949c6fe8d3d062f0e9840558fd85cf5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2542807Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Commit-Queue: Matt Simmons <mattsimmons@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828750}

chrome/android/features/tab_ui/java/src/org/chromium/chrome/browser/tasks/tab_management/suggestions/TabSuggestionsOrchestrator.java

@@ -46,7 +46,7 @@ public class TabSuggestionsOrchestrator implements TabSuggestions, Destroyable {
     private static final int MIN_CLOSE_SUGGESTIONS_THRESHOLD = 3;
     private static final String SHARED_PREFERENCES_ID = "TabsuggestionsPreferences";
 
-    private static final int MIN_TIME_BETWEEN_PREFETCHES_DEFAULT_MS = 5000;
+    private static final int MIN_TIME_BETWEEN_PREFETCHES_DEFAULT_MS = 30000;
 
     protected TabContextObserver mTabContextObserver;
     protected TabSuggestionFeedback mTabSuggestionFeedback;