Refactor intra-strip panel drags by introducing PanelDragController.

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/panels/panel.h"
@@ skipping 482 matching lines @@
       GtkTargetList* list = ui::GetTargetListFromCodeMask(ui::CHROME_TAB);
       gtk_drag_begin(drag_widget_, list, GDK_ACTION_MOVE, 1, last_mouse_down_);
       // gtk_drag_begin increments reference count for GtkTargetList.  So unref
       // it here to reduce the reference count.
       gtk_target_list_unref(list);
     }
     panel_->manager()->StartDragging(panel_.get());
   }
 
   if (drag_widget_) {
-    panel_->manager()->Drag(new_x - old_x);
+    panel_->manager()->Drag(new_x - old_x, new_y - old_y);
     gdk_event_free(last_mouse_down_);
     last_mouse_down_ = gdk_event_copy(event);
   }
 }
 
 void PanelBrowserWindowGtk::AnimationEnded(const ui::Animation* animation) {
   titlebar()->SendEnterNotifyToCloseButtonIfUnderMouse();
 
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_PANEL_BOUNDS_ANIMATIONS_FINISHED,
@@ skipping 297 matching lines @@
   }
 }
 
 bool NativePanelTestingGtk::IsWindowSizeKnown() const {
   return panel_browser_window_gtk_->window_size_known_;
 }
 
 bool NativePanelTestingGtk::IsAnimatingBounds() const {
   return panel_browser_window_gtk_->IsAnimatingBounds();
 }