Use XGrabPointer instead of XChangeActivatePointerGrab() to change the cursor during a pointer grab

ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.h"
 
 #include <X11/Xatom.h>
 
 #include "base/event_types.h"
 #include "base/lazy_instance.h"
@@ skipping 676 matching lines @@
 
   // It is possible for the DesktopWindowTreeHostX11 to be destroyed during the
   // move loop, which would also destroy this drag-client. So keep track of
   // whether it is alive after the drag ends.
   base::WeakPtr<DesktopDragDropClientAuraX11> alive(
       weak_ptr_factory_.GetWeakPtr());
 
   // Windows has a specific method, DoDragDrop(), which performs the entire
   // drag. We have to emulate this, so we spin off a nested runloop which will
   // track all cursor movement and reroute events to a specific handler.
-  move_loop_->RunMoveLoop(
-      source_window,
+  move_loop_->RunMoveLoop(source_window);
+  move_loop_->UpdateCursor(
       cursor_manager_->GetInitializedCursor(ui::kCursorGrabbing));

[sadrul, 2015/01/16 15:38:09]

Is this going to do the right thing (i.e. would the cursor be updated to the
grabbing cursor correctly before dragging)?

 
   if (alive) {
     drag_widget_.reset();
 
     source_provider_ = NULL;
     g_current_drag_drop_client = NULL;
     drag_operation_ = 0;
     XDeleteProperty(xdisplay_, xwindow_, atom_cache_.GetAtom("XdndActionList"));
     XDeleteProperty(xdisplay_, xwindow_, atom_cache_.GetAtom(kXdndDirectSave0));
 
@@ skipping 482 matching lines @@
     for (int x = 0; x < in_bitmap->width(); ++x) {
       if (SkColorGetA(in_row[x]) > kMinAlpha)
         return true;
     }
   }
 
   return false;
 }
 
 }  // namespace views