[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 {
+  [self closeToolsMenu:nil];

[edchin, 2017/02/15 04:14:50]

Pls comment that this closes the menu when the device is rotated,
or the app is split on tablet,
and ensures that you don't get an inconsistent state when 
device has both compact and regular widths.

[marq (ping after 24h), 2017/02/15 15:06:16]

I'd like to not "fake" calls to target/action methods for cases like this; this
should just call [self.toolbarCommandHandler closeToolsMenu];

[sczs, 2017/02/16 00:31:39]

Done.

+}
+
 #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