Allow the user to drag a window from one display to another

ash/wm/window_resizer.cc

Index: ash/wm/window_resizer.cc
diff --git a/ash/wm/window_resizer.cc b/ash/wm/window_resizer.cc
index 98751066733aa715ee492ce66597f09b3fc70742..42655b9c89eef61712324c1e6373633a7cc6f8ca 100644
--- a/ash/wm/window_resizer.cc
+++ b/ash/wm/window_resizer.cc
@@ -6,7 +6,9 @@
 
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
+#include "ash/wm/coordinate_conversion.h"
 #include "ui/aura/client/aura_constants.h"
+#include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
@@ -183,11 +185,14 @@ int WindowResizer::AlignToGridRoundDown(int location, int grid_size) {
 // static
 gfx::Rect WindowResizer::CalculateBoundsForDrag(
     const Details& details,
-    const gfx::Point& location,
+    const gfx::Point& location_in_screen,
     int grid_size) {
   if (!details.is_resizable)
     return details.initial_bounds;
 
+  gfx::Point location = location_in_screen;
+  wm::ConvertPointFromScreen(details.window->GetRootWindow(), &location);
+
   int delta_x = location.x() - details.initial_location_in_parent.x();
   int delta_y = location.y() - details.initial_location_in_parent.y();