Creates BrowserTabStripTracker to consolidate common code

chrome/browser/ui/ash/launcher/browser_status_monitor.h

Index: chrome/browser/ui/ash/launcher/browser_status_monitor.h
diff --git a/chrome/browser/ui/ash/launcher/browser_status_monitor.h b/chrome/browser/ui/ash/launcher/browser_status_monitor.h
index e7671bae4dd48ff034194170376711dd0d3a4023..1f6348813570df84ddd2d2834bc5d64eccb8737b 100644
--- a/chrome/browser/ui/ash/launcher/browser_status_monitor.h
+++ b/chrome/browser/ui/ash/launcher/browser_status_monitor.h
@@ -14,6 +14,8 @@
 #include "base/scoped_observer.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
 #include "chrome/browser/ui/browser_list_observer.h"
+#include "chrome/browser/ui/browser_tab_strip_tracker.h"
+#include "chrome/browser/ui/browser_tab_strip_tracker_delegate.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
 #include "ui/aura/window_observer.h"
 #include "ui/gfx/display_observer.h"
@@ -34,6 +36,7 @@ class Browser;
 // active tab changes.
 class BrowserStatusMonitor : public aura::client::ActivationChangeObserver,
                              public aura::WindowObserver,
+                             public BrowserTabStripTrackerDelegate,
                              public chrome::BrowserListObserver,
                              public gfx::DisplayObserver,
                              public TabStripModelObserver {
@@ -64,6 +67,9 @@ class BrowserStatusMonitor : public aura::client::ActivationChangeObserver,
   // aura::WindowObserver overrides:
   void OnWindowDestroyed(aura::Window* window) override;
 
+  // BrowserTabStripTrackerDelegate overrides:
+  bool ShouldTrackBrowser(Browser* browser) override;
+
   // chrome::BrowserListObserver overrides:
   void OnBrowserAdded(Browser* browser) override;
   void OnBrowserRemoved(Browser* browser) override;
@@ -141,6 +147,8 @@ class BrowserStatusMonitor : public aura::client::ActivationChangeObserver,
   WebContentsToObserverMap webcontents_to_observer_map_;
   scoped_ptr<SettingsWindowObserver> settings_window_observer_;
 
+  BrowserTabStripTracker browser_tab_strip_tracker_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserStatusMonitor);
 };