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

ui/wm/core/focus_controller_unittest.cc

Index: ui/wm/core/focus_controller_unittest.cc
diff --git a/ui/wm/core/focus_controller_unittest.cc b/ui/wm/core/focus_controller_unittest.cc
index 84c691ff37caaec37f8c0f321313ded5b24a5c0d..11c935071598e2ca7108d33a977d50dfefbc4290 100644
--- a/ui/wm/core/focus_controller_unittest.cc
+++ b/ui/wm/core/focus_controller_unittest.cc
@@ -56,7 +56,8 @@ class FocusNotificationObserver : public aura::client::ActivationChangeObserver,
 
  private:
   // Overridden from aura::client::ActivationChangeObserver:
-  void OnWindowActivated(aura::Window* gained_active,
+  void OnWindowActivated(ActivationReason reason,
+                         aura::Window* gained_active,
                          aura::Window* lost_active) override {
     ++activation_changed_count_;
   }
@@ -115,7 +116,8 @@ class RecordingActivationAndFocusChangeObserver
   }
 
   // Overridden from aura::client::ActivationChangeObserver:
-  void OnWindowActivated(aura::Window* gained_active,
+  void OnWindowActivated(ActivationReason reason,
+                         aura::Window* gained_active,
                          aura::Window* lost_active) override {
     if (lost_active && lost_active == deleter_->GetDeletedWindow())
       was_notified_with_deleted_window_ = true;
@@ -158,7 +160,8 @@ class DeleteOnLoseActivationChangeObserver :
   }
 
   // Overridden from aura::client::ActivationChangeObserver:
-  void OnWindowActivated(aura::Window* gained_active,
+  void OnWindowActivated(ActivationReason reason,
+                         aura::Window* gained_active,
                          aura::Window* lost_active) override {
     if (window_ && lost_active == window_) {
       delete lost_active;
@@ -303,7 +306,8 @@ class FocusShiftingActivationObserver
 
  private:
   // Overridden from aura::client::ActivationChangeObserver:
-  void OnWindowActivated(aura::Window* gained_active,
+  void OnWindowActivated(ActivationReason reason,
+                         aura::Window* gained_active,
                          aura::Window* lost_active) override {
     // Shift focus to a child. This should prevent the default focusing from
     // occurring in FocusController::FocusWindow().