Added UMA statistics for changing the active window via click or touch events.

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

Index: chrome/browser/ui/ash/launcher/browser_status_monitor.cc
diff --git a/chrome/browser/ui/ash/launcher/browser_status_monitor.cc b/chrome/browser/ui/ash/launcher/browser_status_monitor.cc
index 08f96c0d5710b7baa038130e2d47a0fc53afcc7d..0ef0124e6e7b549bfac970b43d64adb22a6d7b80 100644
--- a/chrome/browser/ui/ash/launcher/browser_status_monitor.cc
+++ b/chrome/browser/ui/ash/launcher/browser_status_monitor.cc
@@ -164,8 +164,10 @@ void BrowserStatusMonitor::UpdateBrowserItemState() {
       UpdateBrowserItemState();
 }
 
-void BrowserStatusMonitor::OnWindowActivated(aura::Window* gained_active,
-                                             aura::Window* lost_active) {
+void BrowserStatusMonitor::OnWindowActivated(
+    aura::client::ActivationChangeObserver::ActivationReason reason,
+    aura::Window* gained_active,
+    aura::Window* lost_active) {
   Browser* browser = NULL;
   content::WebContents* contents_from_gained = NULL;
   content::WebContents* contents_from_lost = NULL;