[ios clean] Toolbar displays total number of tabs.

ios/clean/chrome/browser/ui/toolbar/toolbar_constants.h

 // Copyright 2017 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.
 
 #ifndef IOS_CLEAN_CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_CONSTANTS_H_
 #define IOS_CLEAN_CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_CONSTANTS_H_
 
 #import <CoreGraphics/CoreGraphics.h>
+#import <Foundation/Foundation.h>
+
+// All kxxxColor constants are RGB values stored in a Hex integer. These will be
+// converted into UIColors using the UIColorFromRGB() function, from
+// uikit_ui_util.h
 
 // Toolbar styling.
-extern const CGFloat kToolbarBackgroundBrightness;
+extern const CGFloat kToolbarBackgroundColor;
 
 // Stackview constraints.
 extern const CGFloat kVerticalMargin;
 extern const CGFloat kHorizontalMargin;
 extern const CGFloat kStackViewSpacing;
 
 // Location bar styling.
 extern const CGFloat kLocationBarBorderWidth;
-extern const CGFloat kLocationBarBorderColorBrightness;
+extern const CGFloat kLocationBarBorderColor;
 extern const CGFloat kLocationBarShadowRadius;
 extern const CGFloat kLocationBarShadowOpacity;
 
 // Progress Bar Height.
 extern const CGFloat kProgressBarHeight;
 
 // Toolbar Buttons.
 extern const CGFloat kToolbarButtonWidth;
+extern const CGFloat kToolbarButtonTitleNormalColor;
+extern const CGFloat kToolbarButtonTitleHighlightedColor;
+
+// Maximum number of tabs displayed by the button containing the tab count.
+extern const NSInteger kShowTabStripButtonMaxTabCount;
+
+// Font sizes for the button containing the tab count.
+extern const NSInteger kFontSizeFewerThanTenTabs;
+extern const NSInteger kFontSizeTenTabsOrMore;
 
 #endif  // IOS_CLEAN_CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_CONSTANTS_H_