Rework ash::CursorManager into a corewm object, to share code with desktop.

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index cd317d7168feb92a2f9053842dcb174087045814..1b2e0ab03915598c97d98faceeee7931823be125 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -40,6 +40,7 @@
 #include "ash/wm/always_on_top_controller.h"
 #include "ash/wm/app_list_controller.h"
 #include "ash/wm/ash_activation_controller.h"
+#include "ash/wm/ash_cursor_platform_delegate.h"
 #include "ash/wm/ash_focus_rules.h"
 #include "ash/wm/base_layout_manager.h"
 #include "ash/wm/capture_controller.h"
@@ -198,6 +199,9 @@ Shell::Shell(ShellDelegate* delegate)
 #if defined(OS_CHROMEOS)
       output_configurator_(new chromeos::OutputConfigurator()),
 #endif  // defined(OS_CHROMEOS)
+      cursor_platform_delegate_(new AshCursorPlatformDelegate),
+      cursor_manager_(scoped_ptr<views::corewm::CursorPlatformDelegate>(
+          cursor_platform_delegate_)),
       browser_context_(NULL),
       simulate_modal_window_open_for_testing_(false) {
   DCHECK(delegate_.get());