Eliminates all ash dependencies from WindowModalityController.

ui/views/corewm/window_util.cc

Index: ui/views/corewm/window_util.cc
===================================================================
--- ui/views/corewm/window_util.cc	(revision 170295)
+++ ui/views/corewm/window_util.cc	(working copy)
@@ -4,12 +4,52 @@
 
 #include "ui/views/corewm/window_util.h"
 
+#include "ui/aura/client/activation_client.h"
+#include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
 
 namespace views {
 namespace corewm {
 
+void ActivateWindow(aura::Window* window) {
+  DCHECK(window);
+  DCHECK(window->GetRootWindow());
+  aura::client::GetActivationClient(window->GetRootWindow())->ActivateWindow(
+      window);
+}
+
+void DeactivateWindow(aura::Window* window) {
+  DCHECK(window);
+  DCHECK(window->GetRootWindow());
+  aura::client::GetActivationClient(window->GetRootWindow())->DeactivateWindow(
+      window);
+}
+
+bool IsActiveWindow(aura::Window* window) {
+  DCHECK(window);
+  if (!window->GetRootWindow())
+    return false;
+  aura::client::ActivationClient* client =
+      aura::client::GetActivationClient(window->GetRootWindow());
+  return client && client->GetActiveWindow() == window;
+}
+
+bool CanActivateWindow(aura::Window* window) {
+  DCHECK(window);
+  if (!window->GetRootWindow())
+    return false;
+  aura::client::ActivationClient* client =
+      aura::client::GetActivationClient(window->GetRootWindow());
+  return client && client->CanActivateWindow(window);
+}
+
+aura::Window* GetActivatableWindow(aura::Window* window) {
+  aura::client::ActivationClient* client =
+      aura::client::GetActivationClient(window->GetRootWindow());
+  return client ? client->GetActivatableWindow(window) : NULL;
+}
+
 void DeepDeleteLayers(ui::Layer* layer) {
   std::vector<ui::Layer*> children = layer->children();
   for (std::vector<ui::Layer*>::const_iterator it = children.begin();