Desktop Aura: Allow tab drags out of window.

ui/views/widget/x11_window_event_filter.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/x11_window_event_filter.h"
 
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 #include <X11/extensions/XInput.h>
 #include <X11/extensions/XInput2.h>
@@ skipping 88 matching lines @@
                                                ui::MouseEvent* event) {
   if (event->type() != ui::ET_MOUSE_PRESSED)
     return false;
 
   int component =
       target->delegate()->GetNonClientComponent(event->location());
   if (component == HTCLIENT)
     return false;
 
   // Get the |x_root_window_| location out of the native event.
-  gfx::Point root_location;
-  const base::NativeEvent& native_event = event->native_event();
-  switch (native_event->type) {
-    case ButtonPress: {
-      root_location.SetPoint(native_event->xbutton.x_root,
-                             native_event->xbutton.y_root);
-      break;
-    }
-    case GenericEvent: {
-      XIDeviceEvent* xievent =
-          static_cast<XIDeviceEvent*>(native_event->xcookie.data);
-      root_location.SetPoint(xievent->root_x, xievent->root_y);
-      break;
-    }
-    default: {
-      NOTREACHED();
-      return false;
-    }
-  }
-
+  gfx::Point root_location = event->system_location();
   return DispatchHostWindowDragMovement(component, root_location);
 }
 
 ui::TouchStatus X11WindowEventFilter::PreHandleTouchEvent(
     aura::Window* target,
     ui::TouchEvent* event) {
   return ui::TOUCH_STATUS_UNKNOWN;
 }
 
 ui::GestureStatus X11WindowEventFilter::PreHandleGestureEvent(
@@ skipping 59 matching lines @@
 
   XSendEvent(xdisplay_, x_root_window_, False,
              SubstructureRedirectMask | SubstructureNotifyMask,
              &event);
 
   return true;
 }
 
 }  // namespace views