Allow the cursor to warp even when a window is dragged

ash/wm/default_window_resizer.cc

Index: ash/wm/default_window_resizer.cc
diff --git a/ash/wm/default_window_resizer.cc b/ash/wm/default_window_resizer.cc
index 4368c73b88ba14b3230441fe40d1b8a83ebc0d22..16f4db395f62477e8de40783bc9c55ebfd3ead69 100644
--- a/ash/wm/default_window_resizer.cc
+++ b/ash/wm/default_window_resizer.cc
@@ -7,6 +7,7 @@
 #include "ash/shell.h"
 #include "ash/wm/cursor_manager.h"
 #include "ui/aura/client/aura_constants.h"
+#include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
@@ -32,10 +33,21 @@ DefaultWindowResizer::Create(aura::Window* window,
   return details.is_resizable ? new DefaultWindowResizer(details) : NULL;
 }
 
-void DefaultWindowResizer::Drag(const gfx::Point& location, int event_flags) {
+void DefaultWindowResizer::Drag(const gfx::Point& location_in_screen,
+                                int event_flags) {
+  // TODO(mazda|yusukes): Implement dragging an item from one display to another
+  aura::RootWindow* current_root = Shell::GetRootWindowAt(location_in_screen);
+  if (current_root != details_.window->GetRootWindow())
+    return;
+
+  gfx::Point location_in_root = location_in_screen;
+  aura::client::GetScreenPositionClient(current_root)->
+      ConvertPointFromScreen(current_root, &location_in_root);
+
   int grid_size = event_flags & ui::EF_CONTROL_DOWN ?
                   0 : ash::Shell::GetInstance()->GetGridSize();
-  gfx::Rect bounds(CalculateBoundsForDrag(details_, location, grid_size));
+  gfx::Rect bounds(
+      CalculateBoundsForDrag(details_, location_in_root, grid_size));
   if (bounds != details_.window->bounds()) {
     did_move_or_resize_ = true;
     details_.window->SetBounds(bounds);