Some fixes to panel support on Windows:

chrome/browser/ui/panels/panel.cc

 // Copyright (c) 2011 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 "chrome/browser/ui/panels/panel.h"
 
 #include "base/logging.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 44 matching lines @@
   // The minimized panel should not get the focus.
   if (expansion_state_ == MINIMIZED)
     Deactivate();
 }
 
 bool Panel::ShouldBringUpTitlebar(int mouse_x, int mouse_y) const {
   // Skip the expanded panel.
   if (expansion_state_ == Panel::EXPANDED)
     return false;
 
+  // If the panel is showing titlebar only, we want to keep it up when it is
+  // being dragged.
+  if (expansion_state_ == Panel::TITLE_ONLY && manager()->is_dragging_panel())
+    return true;
+
   // Let the native panel decide.
   return native_panel_->ShouldBringUpPanelTitlebar(mouse_x, mouse_y);
 }
 
 bool Panel::IsDrawingAttention() const {
   return native_panel_->IsDrawingAttention();
 }
 
 void Panel::Show() {
   native_panel_->ShowPanel();
@@ skipping 353 matching lines @@
 }
 #endif
 
 Browser* Panel::browser() const {
   return native_panel_->GetPanelBrowser();
 }
 
 void Panel::DestroyBrowser() {
   native_panel_->DestroyPanelBrowser();
 }