Aura: notify DropHelper when target view is removed.

ui/aura_shell/image_grid.h

 // 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.
 
 #ifndef UI_AURA_SHELL_IMAGE_GRID_H_
 #define UI_AURA_SHELL_IMAGE_GRID_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
+#include "ui/aura_shell/aura_shell_export.h"
 #include "ui/gfx/compositor/layer.h"
 #include "ui/gfx/compositor/layer_delegate.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 namespace gfx {
 class Image;
 }  // namespace gfx
 
 namespace aura_shell {
@@ skipping 28 matching lines @@
 //   |    ..xxx|XXXXXXXXXXXXXXXXXX
 //   |  .xXXXXX|XXXXXXXXXXXXXXXXXX_____
 //   | .xXX    |                    ^ window's top edge
 //   | .xXX    |
 //   +---------+
 //   | xXX|
 //   | xXX|< window's left edge
 //   | xXX|
 //   ...
 //
-class ImageGrid {
+class AURA_SHELL_EXPORT ImageGrid {
  public:
   // Helper class for use by tests.
   class TestAPI {
    public:
     TestAPI(ImageGrid* grid) : grid_(grid) {}
     ui::Layer* top_left_layer() const { return grid_->top_left_layer_.get(); }
     ui::Layer* top_layer() const { return grid_->top_layer_.get(); }
     ui::Layer* top_right_layer() const { return grid_->top_right_layer_.get(); }
     ui::Layer* left_layer() const { return grid_->left_layer_.get(); }
     ui::Layer* center_layer() const { return grid_->center_layer_.get(); }
@@ skipping 107 matching lines @@
   scoped_ptr<ImagePainter> bottom_painter_;
   scoped_ptr<ImagePainter> bottom_right_painter_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageGrid);
 };
 
 }  // namespace internal
 }  // namespace aura_shell
 
 #endif  // UI_AURA_SHELL_IMAGE_GRID_H_