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

chrome/browser/ui/views/frame/browser_view.cc

 // Copyright 2012 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/views/frame/browser_view.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 1522 matching lines @@
   return contents_web_view_;
 }
 
 ToolbarView* BrowserView::GetToolbarView() const {
   return toolbar_;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // BrowserView, TabStripModelObserver implementation:
 
-void BrowserView::TabInsertedAt(WebContents* contents,
+void BrowserView::TabInsertedAt(TabStripModel* tab_strip_model,
+                                WebContents* contents,
                                 int index,
                                 bool foreground) {
 #if defined(USE_AURA)
   // WebContents inserted in tabs might not have been added to the root
   // window yet. Per http://crbug/342672 add them now since drawing the
   // WebContents requires root window specific data - information about
   // the screen the WebContents is drawn on, for example.
   if (!contents->GetNativeView()->GetRootWindow()) {
     aura::Window* window = contents->GetNativeView();
     aura::Window* root_window = GetNativeWindow()->GetRootWindow();
@@ skipping 1107 matching lines @@
 }
 
 extensions::ActiveTabPermissionGranter*
 BrowserView::GetActiveTabPermissionGranter() {
   content::WebContents* web_contents = GetActiveWebContents();
   if (!web_contents)
     return nullptr;
   return extensions::TabHelper::FromWebContents(web_contents)
       ->active_tab_permission_granter();
 }