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

chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc

Index: chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
diff --git a/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc b/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
index 4253caaaf19e16b453b294155a9835eaf6e037a3..0c2bdd72e09ee4e395b75fcc27c9067980f743c1 100644
--- a/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
+++ b/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
@@ -433,7 +433,8 @@ SkColor BrowserTabStripController::GetToolbarTopSeparatorColor() const {
 ////////////////////////////////////////////////////////////////////////////////
 // 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);
@@ -486,8 +487,10 @@ void BrowserTabStripController::TabReplacedAt(TabStripModel* tab_strip_model,
   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);
 }