Make the position of 'n files selected' label synced with the width of navigation list.

ui/file_manager/file_manager/foreground/js/toolbar_controller.js

Index: ui/file_manager/file_manager/foreground/js/toolbar_controller.js
diff --git a/ui/file_manager/file_manager/foreground/js/toolbar_controller.js b/ui/file_manager/file_manager/foreground/js/toolbar_controller.js
index 32476bd10577c14de687e14062c6cf116ae640a0..7f0b3c8ddc809a8ae01472d3be261261cfab9ebe 100644
--- a/ui/file_manager/file_manager/foreground/js/toolbar_controller.js
+++ b/ui/file_manager/file_manager/foreground/js/toolbar_controller.js
@@ -7,8 +7,12 @@
  * status is changed, this class changes the view of toolbar. If cancel
  * selection button is pressed, this class clears the selection.
  * @param {!HTMLElement} cancelSelectionButton Button to cancel selection.
+ * @param {!HTMLElement} cancelSelectionButtonWrapper Wapper for the button,
+ *     which works as a spacer for the filesSelectionLabel.
  * @param {!HTMLElement} filesSelectedLabel Label to show how many files are
  *     selected.
+ * @param {!HTMLElement} navigationList Navigation list on the left pane. The
+ *     position of silesSelectedLabel depends on the navitaion list's width.
  * @param {!FileSelectionHandler} selectionHandler
  * @param {!cr.ui.ListSelectionModel|!cr.ui.ListSingleSelectionModel}
  *     selectionModel
@@ -16,12 +20,20 @@
  * @struct
  */
 function ToolbarController(cancelSelectionButton,
+                           cancelSelectionButtonWrapper,
                            filesSelectedLabel,
+                           navigationList,
                            selectionHandler,
                            selectionModel) {
   /** @private {!HTMLElement} */
+  this.cancelSelectionButtonWrapper_ = cancelSelectionButtonWrapper;
+
+  /** @private {!HTMLElement} */
   this.filesSelectedLabel_ = filesSelectedLabel;
 
+  /** @private {!HTMLElement} */
+  this.navigationList_ = navigationList;
+
   /** @private {!FileSelectionHandler} */
   this.selectionHandler_ = selectionHandler;
 
@@ -34,6 +46,9 @@ function ToolbarController(cancelSelectionButton,
 
   cancelSelectionButton.addEventListener(
       'click', this.onCancelSelectionButtonClicked_.bind(this));
+
+  this.navigationList_.addEventListener(
+      'relayout', this.onNavigationListRelayout_.bind(this));
 }
 
 /**
@@ -73,3 +88,13 @@ ToolbarController.prototype.onSelectionChanged_ = function() {
 ToolbarController.prototype.onCancelSelectionButtonClicked_ = function() {
   this.selectionModel_.unselectAll();
 }
+
+/**
+ * Handles the relayout event occured on the navigation list.
+ * @private
+ */
+ToolbarController.prototype.onNavigationListRelayout_ = function() {
+  // Make the width of spacer same as the width of navigation list.
+  var navWidth = parseFloat(getComputedStyle(this.navigationList_).width);
+  this.cancelSelectionButtonWrapper_.style.width = navWidth + 'px';
+}