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

ui/views/views.gyp

Index: ui/views/views.gyp
diff --git a/ui/views/views.gyp b/ui/views/views.gyp
index 44e3b4295bacf96ad81ff6102e1369afbf6419ae..a2fd26e9453b5c4500fc4bdbc07bf2e03a21b025 100644
--- a/ui/views/views.gyp
+++ b/ui/views/views.gyp
@@ -229,6 +229,8 @@
         'corewm/compound_event_filter.h',
         'corewm/corewm_switches.cc',
         'corewm/corewm_switches.h',
+        'corewm/cursor_controller.cc',
+        'corewm/cursor_controller.h',
         'corewm/focus_controller.cc',
         'corewm/focus_controller.h',
         'corewm/focus_rules.h',
@@ -651,6 +653,7 @@
         'controls/textfield/textfield_views_model_unittest.cc',
         'controls/tree/tree_view_unittest.cc',
         'corewm/compound_event_filter_unittest.cc',
+        'corewm/cursor_controller_unittest.cc',
         'corewm/focus_controller_unittest.cc',
         'corewm/image_grid_unittest.cc',
         'corewm/input_method_event_filter_unittest.cc',