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

ash/wm/panels/panel_layout_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/panels/panel_layout_manager.h"
 
 #include <algorithm>
 #include <map>
 
 #include "ash/screen_util.h"
@@ skipping 495 matching lines @@
 
   if (window_state->IsMinimized())
     MinimizePanel(window_state->window());
   else
     RestorePanel(window_state->window());
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // PanelLayoutManager, aura::client::ActivationChangeObserver implementation:
 
-void PanelLayoutManager::OnWindowActivated(aura::Window* gained_active,
-                                           aura::Window* lost_active) {
+void PanelLayoutManager::OnWindowActivated(
+    aura::client::ActivationChangeObserver::ActivationReason reason,
+    aura::Window* gained_active,
+    aura::Window* lost_active) {
   // Ignore if the panel that is not managed by this was activated.
   if (gained_active && gained_active->type() == ui::wm::WINDOW_TYPE_PANEL &&
       gained_active->parent() == panel_container_) {
     UpdateStacking(gained_active);
     UpdateCallouts();
   }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // PanelLayoutManager, DisplayController::Observer implementation:
@@ skipping 421 matching lines @@
       // Keyboard hidden, restore original bounds if they exist.
       SetChildBounds(panel, panel_state->GetRestoreBoundsInScreen());
     }
   }
   // This bounds change will have caused a change to the Shelf which does not
   // propogate automatically to this class, so manually recalculate bounds.
   OnWindowResized();
 }
 
 }  // namespace ash