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

chrome/browser/ui/views/tabs/browser_tab_strip_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/views/tabs/browser_tab_strip_controller.h"
 
 #include "base/auto_reset.h"
 #include "base/macros.h"
 #include "base/task_runner_util.h"
 #include "base/threading/sequenced_worker_pool.h"
@@ skipping 415 matching lines @@
 }
 
 SkColor BrowserTabStripController::GetToolbarTopSeparatorColor() const {
   return BrowserView::GetBrowserViewForBrowser(browser_)->frame()
       ->GetFrameView()->GetToolbarTopSeparatorColor();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserTabStripController, TabStripModelObserver implementation:
 
-void BrowserTabStripController::TabInsertedAt(WebContents* contents,
+void BrowserTabStripController::TabInsertedAt(TabStripModel* tab_strip_model,
+                                              WebContents* contents,
                                               int model_index,
                                               bool is_active) {
   DCHECK(contents);
   DCHECK(model_->ContainsIndex(model_index));
   AddTab(contents, model_index, is_active);
 }
 
 void BrowserTabStripController::TabDetachedAt(WebContents* contents,
                                               int model_index) {
   // Cancel any pending tab transition.
@@ skipping 32 matching lines @@
   SetTabDataAt(contents, model_index);
 }
 
 void BrowserTabStripController::TabReplacedAt(TabStripModel* tab_strip_model,
                                               WebContents* old_contents,
                                               WebContents* new_contents,
                                               int model_index) {
   SetTabDataAt(new_contents, model_index);
 }
 
-void BrowserTabStripController::TabPinnedStateChanged(WebContents* contents,
-                                                      int model_index) {
+void BrowserTabStripController::TabPinnedStateChanged(
+    TabStripModel* tab_strip_model,
+    WebContents* contents,
+    int model_index) {
   SetTabDataAt(contents, model_index);
 }
 
 void BrowserTabStripController::TabBlockedStateChanged(WebContents* contents,
                                                        int model_index) {
   SetTabDataAt(contents, model_index);
 }
 
 void BrowserTabStripController::SetTabRendererDataFromModel(
     WebContents* contents,
@@ skipping 80 matching lines @@
   content::WebPluginInfo plugin;
   tabstrip_->FileSupported(
       url,
       mime_type.empty() || mime_util::IsSupportedMimeType(mime_type) ||
           content::PluginService::GetInstance()->GetPluginInfo(
               -1,                // process ID
               MSG_ROUTING_NONE,  // routing ID
               model_->profile()->GetResourceContext(), url, GURL(), mime_type,
               false, NULL, &plugin, NULL));
 }