[ios clean] Add overflow buttons for ToolsMenu.

ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // ======                        New Architecture                         =====
 // =         This code is only used in the new iOS Chrome architecture.       =
 // ============================================================================
 
 #import "ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.h"
 
@@ skipping 66 matching lines @@
                                              constant:kVerticalMargin],
     [self.stackView.bottomAnchor constraintEqualToAnchor:self.view.bottomAnchor
                                                 constant:-kVerticalMargin],
     [self.stackView.leadingAnchor
         constraintEqualToAnchor:self.view.layoutMarginsGuide.leadingAnchor],
     [self.stackView.trailingAnchor
         constraintEqualToAnchor:self.view.layoutMarginsGuide.trailingAnchor],
   ]];
 }
 
+- (void)viewWillLayoutSubviews {
+  // This forces the ToolMenu to close whenever a Device Rotation, iPad
+  // Multitasking change, etc. happens.
+  [self.toolbarCommandHandler closeToolsMenu];
+}
+
 #pragma mark - Components Setup
 
 - (void)setUpToolbarButtons {
   // Back button.
   self.backButton = [ToolbarButton backToolbarButton];
   self.backButton.visibilityMask = ToolbarComponentVisibilityCompactWidth |
                                    ToolbarComponentVisibilityRegularWidth;
   [self.backButton addTarget:nil
                       action:@selector(goBack:)
             forControlEvents:UIControlEventTouchUpInside];
@@ skipping 95 matching lines @@
 - (void)updateAllButtonsVisibility {
   for (UIView* view in self.stackView.arrangedSubviews) {
     if ([view isKindOfClass:[ToolbarButton class]]) {
       ToolbarButton* button = base::mac::ObjCCastStrict<ToolbarButton>(view);
       [button setHiddenForCurrentStateAndSizeClass];
     }
   }
 }
 
 @end