[ios clean] Toolbar displays total number of tabs.

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.
 
 #import "ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.h"
 
 #import "base/mac/foundation_util.h"
+#import "ios/chrome/browser/ui/uikit_ui_util.h"
 #import "ios/clean/chrome/browser/ui/actions/tab_strip_actions.h"
 #import "ios/clean/chrome/browser/ui/commands/navigation_commands.h"
 #import "ios/clean/chrome/browser/ui/commands/tab_grid_commands.h"
 #import "ios/clean/chrome/browser/ui/commands/tools_menu_commands.h"
 #import "ios/clean/chrome/browser/ui/toolbar/toolbar_button+factory.h"
 #import "ios/clean/chrome/browser/ui/toolbar/toolbar_component_options.h"
 #import "ios/clean/chrome/browser/ui/toolbar/toolbar_constants.h"
 #import "ios/third_party/material_components_ios/src/components/ProgressView/src/MaterialProgressView.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ skipping 137 matching lines @@
   self.tabSwitchStripButton = [ToolbarButton tabSwitcherStripToolbarButton];
   self.tabSwitchStripButton.visibilityMask =
       ToolbarComponentVisibilityCompactWidth |
       ToolbarComponentVisibilityRegularWidth;
   [buttonConstraints
       addObject:[self.tabSwitchStripButton.widthAnchor
                     constraintEqualToConstant:kToolbarButtonWidth]];
   [self.tabSwitchStripButton addTarget:nil
                                 action:@selector(showTabStrip:)
                       forControlEvents:UIControlEventTouchUpInside];
+  [self.tabSwitchStripButton
+      setTitleColor:[UIColor colorWithWhite:kToolbarButtonTitleNormalColor
+                                      alpha:1.0]
+           forState:UIControlStateNormal];
+  [self.tabSwitchStripButton
+      setTitleColor:UIColorFromRGB(kToolbarButtonTitleHighlightedColor, 1.0)

[marq (ping after 24h), 2017/05/29 11:04:37]

I think you can omit the alpha (1.0) parameter if it's the default (which is
1.0). 

[sczs, 2017/05/30 00:18:21]

Done.

+           forState:UIControlStateHighlighted];
 
   // Tab switcher Grid button.
   self.tabSwitchGridButton = [ToolbarButton tabSwitcherGridToolbarButton];
   self.tabSwitchGridButton.visibilityMask =
       ToolbarComponentVisibilityCompactWidth |
       ToolbarComponentVisibilityRegularWidth;
   [buttonConstraints
       addObject:[self.tabSwitchGridButton.widthAnchor
                     constraintEqualToConstant:kToolbarButtonWidth]];
   [self.tabSwitchGridButton addTarget:self
@@ skipping 141 matching lines @@
   self.reloadButton.hiddenInCurrentState = isLoading;
   self.stopButton.hiddenInCurrentState = !isLoading;
   [self.progressBar setHidden:!isLoading animated:YES completion:nil];
   [self updateAllButtonsVisibility];
 }
 
 - (void)setLoadingProgress:(double)progress {
   [self.progressBar setProgress:progress animated:YES completion:nil];
 }
 
+- (void)setNumberOfTabs:(int)numberOfTabs {
+  [self.tabSwitchStripButton
+      setTitle:[NSString stringWithFormat:@"%d", numberOfTabs]

[marq (ping after 24h), 2017/05/29 11:04:37]

Duplicate or refactor the logic from [ToolbarController setTabCount:] to include
font sizing, and handling of large tab counts.

[sczs, 2017/05/30 00:18:21]

Done.

+      forState:UIControlStateNormal];
+}
+
 #pragma mark - ZoomTransitionDelegate
 
 - (CGRect)rectForZoomWithKey:(NSObject*)key inView:(UIView*)view {
   return [view convertRect:self.toolsMenuButton.bounds
                   fromView:self.toolsMenuButton];
 }
 
 #pragma mark - Private Methods
 
 - (void)showToolsMenu:(id)sender {
@@ skipping 57 matching lines @@
 // Sets the priority for an array of constraints and activates them.
 - (void)activateConstraints:(NSArray*)constraintsArray
                withPriority:(UILayoutPriority)priority {
   for (NSLayoutConstraint* constraint in constraintsArray) {
     constraint.priority = priority;
   }
   [NSLayoutConstraint activateConstraints:constraintsArray];
 }
 
 @end