Add metrics to keep track of the tab activate/deactivate cycle

chrome/browser/ui/toolbar/toolbar_actions_bar.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/ui/toolbar/toolbar_actions_bar.h"
 
 #include <utility>
 
 #include "base/auto_reset.h"
 #include "base/location.h"
@@ skipping 775 matching lines @@
   CreateActions();
 
   // TODO(robliao): Remove ScopedTracker below once https://crbug.com/463337 is
   // fixed.
   tracked_objects::ScopedTracker tracking_profile(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
           "ToolbarActionsBar::OnToolbarModelInitialized"));
   ResizeDelegate(gfx::Tween::EASE_OUT, false);
 }
 
-void ToolbarActionsBar::TabInsertedAt(content::WebContents* contents,
+void ToolbarActionsBar::TabInsertedAt(TabStripModel* tab_strip_model,
+                                      content::WebContents* contents,
                                       int index,
                                       bool foreground) {
   if (foreground)
     extensions::MaybeShowExtensionControlledNewTabPage(browser_, contents);
 }
 
 void ToolbarActionsBar::ReorderActions() {
   if (toolbar_actions_.empty())
     return;
 
@@ skipping 17 matching lines @@
   for (ToolbarActionViewController* action : toolbar_actions_) {
     if (action->GetId() == action_id)
       return action;
   }
   return nullptr;
 }
 
 content::WebContents* ToolbarActionsBar::GetCurrentWebContents() {
   return browser_->tab_strip_model()->GetActiveWebContents();
 }