Make GTK Panels ignore mouse/keyboard events after drag is ended until mouse is released.

chrome/browser/ui/panels/panel_browser_window_gtk.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 "chrome/browser/ui/panels/panel_browser_window_gtk.h"
 
 #include "base/bind.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/gtk/browser_titlebar.h"
 #include "chrome/browser/ui/gtk/custom_button.h"
@@ skipping 620 matching lines @@
   event->motion.y_root = mouse_location.y();
   panel_browser_window_gtk_->drag_helper_->OnMouseMoveEvent(
       NULL, reinterpret_cast<GdkEventMotion*>(event));
   gdk_event_free(event);
   MessageLoopForUI::current()->RunAllPending();
 }
 
 void NativePanelTestingGtk::CancelDragTitlebar() {
   if (!panel_browser_window_gtk_->drag_helper_.get())
     return;
-
-  panel_browser_window_gtk_->drag_helper_->EndDrag(true);
+  panel_browser_window_gtk_->drag_helper_->OnGrabBrokenEvent(NULL, NULL);
+  MessageLoopForUI::current()->RunAllPending();
 }
 
 void NativePanelTestingGtk::FinishDragTitlebar() {
   if (!panel_browser_window_gtk_->drag_helper_.get())
     return;
-
-  panel_browser_window_gtk_->drag_helper_->EndDrag(false);
+  ReleaseMouseButtonTitlebar(panel::NO_MODIFIER);
 }
 
 bool NativePanelTestingGtk::VerifyDrawingAttention() const {
   std::string title;
   BrowserWindowGtk::TitleDecoration decoration =
       panel_browser_window_gtk_->GetWindowTitle(&title);
   return panel_browser_window_gtk_->IsDrawingAttention() &&
          decoration == BrowserWindowGtk::PANGO_MARKUP;
 }
 
@@ skipping 31 matching lines @@
       break;
     case RESTORE_BUTTON:
       button = titlebar->unminimize_button();
       break;
     default:
       NOTREACHED();
       return false;
   }
   return gtk_widget_get_visible(button->widget());
 }