Implement cursor compositing mode on Ash

ash/display/display_controller.cc

Index: ash/display/display_controller.cc
diff --git a/ash/display/display_controller.cc b/ash/display/display_controller.cc
index 7b7cc5882e5592a336e718a28d2fa3c442bb5215..f337d23feac25e160a4e5e20660a5b70d3b5fdd8 100644
--- a/ash/display/display_controller.cc
+++ b/ash/display/display_controller.cc
@@ -9,6 +9,7 @@
 #include <map>
 
 #include "ash/ash_switches.h"
+#include "ash/display/cursor_window_controller.h"
 #include "ash/display/display_layout_store.h"
 #include "ash/display/display_manager.h"
 #include "ash/display/mirror_window_controller.h"
@@ -216,6 +217,7 @@ bool DisplayController::DisplayChangeLimiter::IsThrottled() const {
 DisplayController::DisplayController()
     : primary_root_window_for_replace_(NULL),
       focus_activation_store_(new internal::FocusActivationStore()),
+      cursor_window_controller_(new internal::CursorWindowController(false)),
       mirror_window_controller_(new internal::MirrorWindowController),
       virtual_keyboard_window_controller_(
           new internal::VirtualKeyboardWindowController) {
@@ -249,6 +251,7 @@ void DisplayController::Shutdown() {
   // DisplayManager outlives DisplayController.
   Shell::GetInstance()->display_manager()->set_delegate(NULL);
 
+  cursor_window_controller_.reset();
   mirror_window_controller_.reset();
   virtual_keyboard_window_controller_.reset();
 
@@ -400,6 +403,10 @@ void DisplayController::SwapPrimaryDisplay() {
   }
 }
 
+void DisplayController::EnableCompositedCursor(aura::Window* container) {
+  cursor_window_controller_->InitCursorWindow(container);
+}
+
 void DisplayController::SetPrimaryDisplayId(int64 id) {
   DCHECK_NE(gfx::Display::kInvalidDisplayID, id);
   if (id == gfx::Display::kInvalidDisplayID || primary_display_id == id)