Have Notifications appear over docked windows

ash/shelf/shelf_layout_manager.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 "ash/shelf/shelf_layout_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <cstring>
 #include <string>
@@ skipping 840 matching lines @@
       gfx::Rect(0, 0,
                 shelf_width - status_size.width(),
                 target_bounds->shelf_bounds_in_root.height()),
       gfx::Rect(0, 0, target_bounds->shelf_bounds_in_root.width(),
                 shelf_height - status_size.height()),
       gfx::Rect(0, 0, target_bounds->shelf_bounds_in_root.width(),
                 shelf_height - status_size.height()),
       gfx::Rect(0, 0,
                 shelf_width - status_size.width(),
                 target_bounds->shelf_bounds_in_root.height()));
+
+  non_shelf_bounds_ = available_bounds;
+  non_shelf_bounds_.Subtract(target_bounds->shelf_bounds_in_root);
 }
 
 void ShelfLayoutManager::UpdateTargetBoundsForGesture(
     TargetBounds* target_bounds) const {
   CHECK_EQ(GESTURE_DRAG_IN_PROGRESS, gesture_drag_status_);
   bool horizontal = IsHorizontalAlignment();
   const gfx::Rect& available_bounds(root_window_->bounds());
   int resistance_free_region = 0;
 
   if (gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_HIDDEN &&
@@ skipping 315 matching lines @@
     return false;
   }
   if (session_state_delegate->IsUserSessionBlocked() ||
       state_.is_adding_user_screen) {
     return true;
   }
   return false;
 }
 
 }  // namespace ash