[ios clean] Toolbar displays total number of tabs.

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

 // 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.
 
 #import "ios/clean/chrome/browser/ui/toolbar/toolbar_constants.h"
 
 const CGFloat kToolbarBackgroundBrightness = 242.0 / 255.0;
 
 const CGFloat kVerticalMargin = 7.0f;
 const CGFloat kHorizontalMargin = 1.0f;
 const CGFloat kStackViewSpacing = 2.0f;
 
 const CGFloat kLocationBarBorderWidth = 1.0f;
 const CGFloat kLocationBarBorderColorBrightness = 208.0 / 255.0;
 const CGFloat kLocationBarShadowRadius = 0.0f;
 const CGFloat kLocationBarShadowOpacity = 0.2f;
 
 const CGFloat kProgressBarHeight = 2.0f;
 
 const CGFloat kToolbarButtonWidth = 42.0f;
+const CGFloat kToolbarButtonTitleNormalColor = 85.0 / 255.0;
+const CGFloat kToolbarButtonTitleHighlightedColor = 0x4285F4;

[marq (ping after 24h), 2017/05/29 11:04:36]

Neither of these are 'colors' in the usual sense -- the first is (I'm guessing)
a white value, and the second is an RGB triplet packed into a hex integer.
Please be clear and consistent in naming and implementation, and document in the
public API how the values of these constants should be interpreted.

(I'm fine with using the packed-hex values, but if we do that, then
kToolbarButtonTitleNormalColor should be 0x858585).

[sczs, 2017/05/30 00:18:20]

Sounds good. If we want to have consistency and not that many constants I think
using the Hex values is the best choice.