aura: Fix a couple of drag drop issues:

ui/aura/root_window.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/aura/root_window.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "ui/aura/aura_switches.h"
 #include "ui/aura/client/activation_client.h"
 #include "ui/aura/client/capture_client.h"
+#include "ui/aura/client/drag_drop_client.h"
 #include "ui/aura/client/event_client.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/event.h"
 #include "ui/aura/event_filter.h"
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/display_manager.h"
 #include "ui/aura/root_window_host.h"
 #include "ui/aura/root_window_observer.h"
 #include "ui/aura/window.h"
@@ skipping 184 matching lines @@
     SetLastMouseLocation(this, ui::ConvertPointToDIP(layer(), point));
 
   synthesize_mouse_move_ = false;
 }
 
 gfx::Point RootWindow::GetHostOrigin() const {
   return host_->GetBounds().origin();
 }
 
 void RootWindow::SetCursor(gfx::NativeCursor cursor) {
+  // If a drag is in progress, the DragDropClient should override the cursor.
+  client::DragDropClient* dnd_client = client::GetDragDropClient(this);
+  if (dnd_client && dnd_client->IsDragDropInProgress())
+    cursor = dnd_client->GetDragCursor();
+
   last_cursor_ = cursor;
   // A lot of code seems to depend on NULL cursors actually showing an arrow,
   // so just pass everything along to the host.
   host_->SetCursor(cursor);
 }
 
 void RootWindow::ShowCursor(bool show) {
   cursor_shown_ = show;
   host_->ShowCursor(show);
 }
@@ skipping 805 matching lines @@
 void RootWindow::UnlockCompositor() {
   DCHECK(compositor_lock_);
   compositor_lock_ = NULL;
   if (draw_on_compositor_unlock_) {
     draw_on_compositor_unlock_ = false;
     ScheduleDraw();
   }
 }
 
 }  // namespace aura