Move ash specific cursor code to CursorManager.

ui/aura/shared/compound_event_filter.cc

Index: ui/aura/shared/compound_event_filter.cc
diff --git a/ui/aura/shared/compound_event_filter.cc b/ui/aura/shared/compound_event_filter.cc
index b9f0716174218c55da9135bc75d63499fc4bc23a..b14712ec93ef52f6eab934489db0a79c50245e39 100644
--- a/ui/aura/shared/compound_event_filter.cc
+++ b/ui/aura/shared/compound_event_filter.cc
@@ -86,8 +86,9 @@ size_t CompoundEventFilter::GetFilterCount() const {
 // CompoundEventFilter, private:
 
 void CompoundEventFilter::UpdateCursor(Window* target, ui::MouseEvent* event) {
+  aura::RootWindow* root_window = target->GetRootWindow();
   client::CursorClient* client =
-      client::GetCursorClient(target->GetRootWindow());
+      client::GetCursorClient(root_window);
   if (client) {
     gfx::NativeCursor cursor = target->GetCursor(event->location());
     if (event->flags() & ui::EF_IS_NON_CLIENT) {
@@ -97,6 +98,8 @@ void CompoundEventFilter::UpdateCursor(Window* target, ui::MouseEvent* event) {
     }
 
     client->SetCursor(cursor);
+    client->SetDeviceScaleFactor(
+        root_window->AsRootWindowHostDelegate()->GetDeviceScaleFactor());
   }
 }