Move ash specific cursor code to CursorManager.

ash/display/mouse_cursor_event_filter.cc

Index: ash/display/mouse_cursor_event_filter.cc
diff --git a/ash/display/mouse_cursor_event_filter.cc b/ash/display/mouse_cursor_event_filter.cc
index fafe89757caab1563ab1c7135812a433e8635f47..dd2e04b63ed7b1464a0c12273e48cbebeec789e0 100644
--- a/ash/display/mouse_cursor_event_filter.cc
+++ b/ash/display/mouse_cursor_event_filter.cc
@@ -152,6 +152,8 @@ bool MouseCursorEventFilter::WarpMouseCursorIfNecessary(
   if (dst_root->bounds().Contains(point_in_dst_screen)) {
     DCHECK_NE(dst_root, current_root);
     dst_root->MoveCursorTo(point_in_dst_screen);
+    ash::Shell::GetInstance()->cursor_manager()->SetDeviceScaleFactor(
+        dst_root->AsRootWindowHostDelegate()->GetDeviceScaleFactor());

[oshima, 2012/09/07 19:52:01]

relative position to the root window can change without warp, such as when
display configuration changes. Does this CL cover all cases?

[mazda, 2012/09/07 22:38:14]

Cursor is updated immediately in CompoundEventFilter when a mouse event is sent.
XWarpCursor causes MotionNotify x event and ends up sending ui::MouseEvent, so
it should be covered.
Are there any cases that the position can change without using XWarpCursor?

[oshima, 2012/09/07 23:08:20]

Ah, right, so you don't need in that case. I still think you need to update the
cursor
when scale factor of the window changes (happens when you switch to mirroring)

[mazda, 2012/09/08 00:27:02]

Added the code for handling scale factor change to
RootWindow::OnDeviceScaleFactorChanged.

     return true;
   }
   return false;