Move the concept of Activation to the Shell.

ui/aura_shell/root_window_event_filter.cc

Index: ui/aura_shell/root_window_event_filter.cc
===================================================================
--- ui/aura_shell/root_window_event_filter.cc	(revision 114022)
+++ ui/aura_shell/root_window_event_filter.cc	(working copy)
@@ -8,8 +8,9 @@
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window_delegate.h"
+#include "ui/aura_shell/activation_controller.h"
 #include "ui/aura_shell/shell.h"
-#include "ui/aura_shell/stacking_controller.h"
+#include "ui/aura_shell/window_util.h"
 #include "ui/base/hit_test.h"
 
 namespace aura_shell {
@@ -79,7 +80,7 @@
     return true;
 
   if (event->type() == ui::ET_MOUSE_PRESSED)
-    ActivateIfNecessary(target, event);
+    target->GetFocusManager()->SetFocusedWindow(target);
 
   return false;
 }
@@ -92,24 +93,13 @@
     return status;
 
   if (event->type() == ui::ET_TOUCH_PRESSED)
-    ActivateIfNecessary(target, event);
+    target->GetFocusManager()->SetFocusedWindow(target);
   return ui::TOUCH_STATUS_UNKNOWN;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // RootWindowEventFilter, private:
 
-void RootWindowEventFilter::ActivateIfNecessary(aura::Window* window,
-                                                aura::Event* event) {
-  aura::Window* activatable = StackingController::GetActivatableWindow(window);
-  if (activatable == aura::RootWindow::GetInstance()->active_window()) {
-    // |window| is a descendant of the active window, no need to activate.
-    window->GetFocusManager()->SetFocusedWindow(window);
-  } else {
-    aura::RootWindow::GetInstance()->SetActiveWindow(activatable, window);
-  }
-}
-
 void RootWindowEventFilter::UpdateCursor(aura::Window* target,
                                          aura::MouseEvent* event) {
   gfx::NativeCursor cursor = target->GetCursor(event->location());