[ios clean] Toolbar displays total number of tabs.

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

Index: ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.mm
diff --git a/ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.mm b/ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.mm
index b8b60ca57f33f78eadfb217ffa245305362647d4..58885321e92f60551baeda087447c4bbf68c02d8 100644
--- a/ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.mm
+++ b/ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.mm
@@ -5,6 +5,7 @@
 #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"
@@ -162,6 +163,13 @@
   [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];
@@ -323,6 +331,12 @@
   [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 {