[TabSelectionEditor] Long press to select/deselect items

Change-Id: I20e36b47a4e4111269e660142819a9e22bc2f544
Bug: 987206, 970266
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1719614
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682121}

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

@@ -140,6 +140,10 @@ class TabGridViewBinder {
                 item.get(TabProperties.SELECTABLE_TAB_CLICKED_LISTENER).run(holder.getTabId());
                 selectionHolder.selectableTabGridView.onClick();
             });
+            selectionHolder.itemView.setOnLongClickListener(view -> {
+                item.get(TabProperties.SELECTABLE_TAB_CLICKED_LISTENER).run(holder.getTabId());
+                return selectionHolder.selectableTabGridView.onLongClick(view);
+            });
         } else if (TabProperties.TITLE == propertyKey) {
             String title = item.get(TabProperties.TITLE);
             selectionHolder.actionButton.setContentDescription(

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

@@ -82,6 +82,7 @@ public class TabListCoordinator implements Destroyable {
      * @param dialogHandler A handler to handle requests about updating TabGridDialog.
      * @param itemViewTypeCallback Callback that returns the view type for each item in the list.
      * @param selectionDelegateProvider Provider to provide selected Tabs for a selectable tab list.
+     *                                  It's NULL when selection is not possible.
      * @param parentView {@link ViewGroup} The root view of the UI.
      * @param dynamicResourceLoader The {@link DynamicResourceLoader} to register dynamic UI
      *                              resource for compositor layer animation.
@@ -98,7 +99,7 @@ public class TabListCoordinator implements Destroyable {
                     .GridCardOnClickListenerProvider gridCardOnClickListenerProvider,
             @Nullable TabListMediator.TabGridDialogHandler dialogHandler,
             SimpleRecyclerViewMcpBase.ItemViewTypeCallback<PropertyModel> itemViewTypeCallback,
-            TabListMediator.SelectionDelegateProvider selectionDelegateProvider,
+            @Nullable TabListMediator.SelectionDelegateProvider selectionDelegateProvider,
             @NonNull ViewGroup parentView, @Nullable DynamicResourceLoader dynamicResourceLoader,
             boolean attachToParent, String componentName) {
         TabListModel tabListModel = new TabListModel();
@@ -180,7 +181,7 @@ public class TabListCoordinator implements Destroyable {
                 createGroupButtonProvider, selectionDelegateProvider,
                 gridCardOnClickListenerProvider, dialogHandler, componentName);
 
-        if (mMode == TabListMode.GRID) {
+        if (mMode == TabListMode.GRID && selectionDelegateProvider == null) {
             ItemTouchHelper touchHelper = new ItemTouchHelper(mMediator.getItemTouchHelperCallback(
                     context.getResources().getDimension(R.dimen.swipe_to_dismiss_threshold),
                     context.getResources().getDimension(R.dimen.tab_grid_merge_threshold),