[ios clean] ToolsMenu Mediator observes Webstate.

ios/clean/chrome/browser/ui/tools/menu_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.
 
 #import "ios/clean/chrome/browser/ui/tools/menu_view_controller.h"
 
 #include "base/i18n/rtl.h"
 #import "base/logging.h"
 #import "base/mac/foundation_util.h"
 #import "base/macros.h"
@@ skipping 65 matching lines @@
   self.view.backgroundColor = [UIColor whiteColor];
   self.view.autoresizingMask = UIViewAutoresizingNone;
   self.view.layer.borderColor = [UIColor clearColor].CGColor;
 }
 
 - (void)viewDidLoad {
   self.menuScrollView = [[UIScrollView alloc] init];
   self.menuScrollView.translatesAutoresizingMaskIntoConstraints = NO;
   [self.view addSubview:self.menuScrollView];
 
-  // PLACEHOLDER: Hardcoded value until the mediator observes the Webstate.
-  self.currentPageLoading = NO;
-
   [self setupCloseMenuButton];
   [self setupMenuStackView];
   [self setupConstraints];
 }
 
 #pragma mark - UI Setup
 
 - (void)setupCloseMenuButton {
   // Add close tools menu button. This button is fixed on the top right corner
   // and will always be visible.
@@ skipping 147 matching lines @@
 #pragma mark - Tools Consumer
 
 - (void)setToolsMenuItems:(NSArray*)menuItems {
   _menuItems = menuItems;
 }
 
 - (void)displayOverflowControls:(BOOL)displayOverflowControls {
   self.displayOverflowControls = displayOverflowControls;
 }
 
+- (void)setIsLoading:(BOOL)isLoading {
+  self.currentPageLoading = isLoading;
+}
+
+- (void)setCurrentPageLoading:(BOOL)currentPageLoading {
+  _currentPageLoading = currentPageLoading;
+  // If the OverflowButtons have been initialized update their visibility.
+  if (self.toolbarOverflowStackView) {
+    self.toolbarOverflowStackView.reloadButton.hidden = currentPageLoading;
+    self.toolbarOverflowStackView.stopButton.hidden = !currentPageLoading;
+  }
+}
+
 @end