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

chrome/browser/ui/browser_command_controller.cc

 // Copyright (c) 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/browser_command_controller.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 645 matching lines @@
 
 void BrowserCommandController::OnSigninAllowedPrefChange() {
   // For unit tests, we don't have a window.
   if (!window())
     return;
   UpdateShowSyncState(IsShowingMainUI());
 }
 
 // BrowserCommandController, TabStripModelObserver implementation:
 
-void BrowserCommandController::TabInsertedAt(WebContents* contents,
+void BrowserCommandController::TabInsertedAt(TabStripModel* tab_strip_model,
+                                             WebContents* contents,
                                              int index,
                                              bool foreground) {
   AddInterstitialObservers(contents);
 }
 
 void BrowserCommandController::TabDetachedAt(WebContents* contents, int index) {
   RemoveInterstitialObservers(contents);
 }
 
 void BrowserCommandController::TabReplacedAt(TabStripModel* tab_strip_model,
@@ skipping 495 matching lines @@
 
 BrowserWindow* BrowserCommandController::window() {
   return browser_->window();
 }
 
 Profile* BrowserCommandController::profile() {
   return browser_->profile();
 }
 
 }  // namespace chrome