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

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index d57f519c1fe699be6beddbb012813f217842f795..89c170a32c52e71119e6ae900ed84616ef6f7a79 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -11,7 +11,6 @@
 #include "ash/ash_export.h"
 #include "ash/shelf_types.h"
 #include "ash/system/user/login_status.h"
-#include "ash/wm/cursor_manager.h"
 #include "ash/wm/system_modal_container_event_filter_delegate.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ -23,6 +22,7 @@
 #include "ui/gfx/insets.h"
 #include "ui/gfx/screen.h"
 #include "ui/gfx/size.h"
+#include "ui/views/corewm/cursor_manager.h"
 
 class CommandLine;
 
@@ -70,6 +70,7 @@ class MessageCenter;
 namespace ash {
 
 class AcceleratorController;
+class AshCursorPlatformDelegate;
 class CapsLockDelegate;
 class DesktopBackgroundController;
 class DisplayController;
@@ -327,7 +328,7 @@ class ASH_EXPORT Shell
   internal::EventTransformationHandler* event_transformation_handler() {
     return event_transformation_handler_.get();
   }
-  CursorManager* cursor_manager() { return &cursor_manager_; }
+  views::corewm::CursorManager* cursor_manager() { return &cursor_manager_; }
 
   ShellDelegate* delegate() { return delegate_.get(); }
 
@@ -585,7 +586,10 @@ class ASH_EXPORT Shell
 
   scoped_ptr<message_center::MessageCenter> message_center_;
 
-  CursorManager cursor_manager_;
+  // |cursor_platform_delegate_| is owned by |cursor_manager_|, but we keep a
+  // pointer to vend to test code.
+  AshCursorPlatformDelegate* cursor_platform_delegate_;
+  views::corewm::CursorManager cursor_manager_;
 
   ObserverList<ShellObserver> observers_;