MD Bookmarks: Show toolbar overlay when multiple items are selected

chrome/browser/resources/md_bookmarks/toolbar.js

Index: chrome/browser/resources/md_bookmarks/toolbar.js
diff --git a/chrome/browser/resources/md_bookmarks/toolbar.js b/chrome/browser/resources/md_bookmarks/toolbar.js
index 8dacb67e248dd00b08ce2c8bf839a8644b9c973e..53a8d93be4ec360564b89f278bc5b2ea0d9fb2b2 100644
--- a/chrome/browser/resources/md_bookmarks/toolbar.js
+++ b/chrome/browser/resources/md_bookmarks/toolbar.js
@@ -20,12 +20,26 @@ Polymer({
       type: String,
       observer: 'onSidebarWidthChanged_',
     },
+
+    showSelectionOverlay: {
+      type: Boolean,
+      computed: 'shouldShowSelectionOverlay_(selectedCount_)',
+      readOnly: true,
+      reflectToAttribute: true,
+    },
+
+    /** @private */
+    selectedCount_: Number,
   },
 
   attached: function() {
     this.watch('searchTerm_', function(state) {
       return state.search.term;
     });
+    this.watch('selectedCount_', function(state) {
+      return state.selection.items.size;
+    });
+    this.updateFromStore();
   },
 
   /** @return {CrToolbarSearchFieldElement} */
@@ -58,6 +72,7 @@ Polymer({
     this.closeDropdownMenu_();
   },
 
+  /** @private */
   onAddFolderTap_: function() {
     var dialog =
         /** @type {BookmarksEditDialogElement} */ (this.$.addDialog.get());
@@ -78,6 +93,11 @@ Polymer({
   },
 
   /** @private */
+  onClearSelectionTap_: function() {
+    this.dispatch(bookmarks.actions.deselectItems());
+  },
+
+  /** @private */
   closeDropdownMenu_: function() {
     var menu = /** @type {!CrActionMenuElement} */ (this.$.dropdown);
     menu.close();
@@ -93,6 +113,7 @@ Polymer({
       this.dispatch(bookmarks.actions.setSearchTerm(searchTerm));
   },
 
+  /** @private */
   onSidebarWidthChanged_: function() {
     this.style.setProperty('--sidebar-width', this.sidebarWidth);
   },
@@ -109,4 +130,20 @@ Polymer({
   hasSearchTerm_: function() {
     return !!this.searchTerm_;
   },
+
+  /**
+   * @return {boolean}
+   * @private
+   */
+  shouldShowSelectionOverlay_: function() {
+    return this.selectedCount_ > 1;
+  },
+
+  /**
+   * @return {string}
+   * @private
+   */
+  numberOfItemsSelected_: function() {
+    return loadTimeData.getStringF('itemsSelected', this.selectedCount_);
+  },
 });