Move the concept of Activation to the Shell.

ui/aura_shell/window_util.cc

Index: ui/aura_shell/window_util.cc
===================================================================
--- ui/aura_shell/window_util.cc	(revision 113647)
+++ ui/aura_shell/window_util.cc	(working copy)
@@ -4,10 +4,21 @@
 
 #include "ui/aura_shell/window_util.h"
 
+#include "ui/aura/client/activation_client.h"
+#include "ui/aura/client/aura_constants.h"
+#include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
-#include "ui/aura/client/aura_constants.h"
+#include "ui/aura_shell/activation_controller.h"
 #include "ui/base/ui_base_types.h"
 
+namespace {
+aura::ActivationClient* GetActivationClient() {
+  return reinterpret_cast<aura::ActivationClient*>(
+      aura::RootWindow::GetInstance()->GetProperty(
+          aura::kRootWindowActivationClient));
+}
+}  // namespace
+
 namespace aura_shell {
 
 bool IsWindowMaximized(aura::Window* window) {
@@ -15,4 +26,28 @@
       ui::SHOW_STATE_MAXIMIZED;
 }
 
+void ActivateWindow(aura::Window* window) {
+  GetActivationClient()->ActivateWindow(window);
+}
+
+void DeactivateWindow(aura::Window* window) {
+  GetActivationClient()->DeactivateWindow(window);
+}
+
+bool IsActiveWindow(aura::Window* window) {
+  return GetActiveWindow() == window;
+}
+
+aura::Window* GetActiveWindow() {
+  return GetActivationClient()->GetActiveWindow();
+}
+
+aura::Window* GetActivatableWindow(aura::Window* window) {
+  return internal::ActivationController::GetActivatableWindow(window);
+}
+
+bool CanFocusWindow(aura::Window* window) {
+  return internal::ActivationController::CanFocusWindow(window);
+}
+
 }  // namespace aura_shell