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

extensions/shell/browser/shell_desktop_controller_aura.h

Index: extensions/shell/browser/shell_desktop_controller_aura.h
diff --git a/extensions/shell/browser/shell_desktop_controller_aura.h b/extensions/shell/browser/shell_desktop_controller_aura.h
index 9a8bc1ff4689cd2b6f56e1d46a7acea9d3b6e4ac..b565471c0cb274a22f8ef6fa953c71420250eb5b 100644
--- a/extensions/shell/browser/shell_desktop_controller_aura.h
+++ b/extensions/shell/browser/shell_desktop_controller_aura.h
@@ -47,6 +47,7 @@ namespace wm {
 class CompoundEventFilter;
 class CursorManager;
 class InputMethodEventFilter;
+class WindowActivationPreTargetHandler;
 }
 
 namespace extensions {
@@ -123,6 +124,9 @@ class ShellDesktopControllerAura
 
   scoped_ptr<wm::InputMethodEventFilter> input_method_filter_;
 
+  scoped_ptr<wm::WindowActivationPreTargetHandler>
+      window_activation_pretarget_handler_;
+
   scoped_ptr<aura::client::FocusClient> focus_client_;
 
   scoped_ptr<wm::CursorManager> cursor_manager_;