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

chrome/browser/ui/views/extensions/extension_popup_aura.h

Index: chrome/browser/ui/views/extensions/extension_popup_aura.h
diff --git a/chrome/browser/ui/views/extensions/extension_popup_aura.h b/chrome/browser/ui/views/extensions/extension_popup_aura.h
index d9b0dbf86f17a4b090bfeb2006bbf669d62a3219..d9b8e50cc6bb25ec9364d2068701bed1492ebb46 100644
--- a/chrome/browser/ui/views/extensions/extension_popup_aura.h
+++ b/chrome/browser/ui/views/extensions/extension_popup_aura.h
@@ -21,8 +21,10 @@ class ExtensionPopupAura : public ExtensionPopup,
   void OnWidgetDestroying(views::Widget* widget) override;
 
   // aura::client::ActivationChangeObserver overrides.
-  void OnWindowActivated(aura::Window* gained_active,
-                         aura::Window* lost_active) override;
+  void OnWindowActivated(
+      aura::client::ActivationChangeObserver::ActivationReason reason,
+      aura::Window* gained_active,
+      aura::Window* lost_active) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ExtensionPopupAura);