Download Home : Back press doesn't update contents

Fixed an issue where the filter change callback was not getting propagated
correctly to the mutator, due to which the back button press was unable
to update the contents of the tab.

Bug: 899936
Change-Id: I46f83fd651a453aba875c62ef47da9d8ee8b2067
Reviewed-on: https://chromium-review.googlesource.com/c/1309427Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604841}

chrome/android/java/src/org/chromium/chrome/browser/download/home/filter/FilterCoordinator.java

@@ -77,13 +77,17 @@ public class FilterCoordinator {
      * components might need to update the UI state.
      */
     public void setSelectedFilter(@FilterType int filter) {
+        @TabType
+        int tabSelected;
         if (filter == Filters.FilterType.PREFETCHED
                 && PrefetchConfiguration.isPrefetchingFlagEnabled()) {
-            selectTab(TabType.PREFETCH);
+            tabSelected = TabType.PREFETCH;
         } else {
             mChipsProvider.setFilterSelected(filter);
-            selectTab(TabType.FILES);
+            tabSelected = TabType.FILES;
         }
+
+        handleTabSelected(tabSelected);
     }
 
     private void selectTab(@TabType int selectedTab) {