Introduce ui.dll / libui.so for the component build.

ui/base/dragdrop/drag_source.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_BASE_DRAGDROP_DRAG_SOURCE_H_
 #define UI_BASE_DRAGDROP_DRAG_SOURCE_H_
 #pragma once
 
 #include <objidl.h>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
+#include "ui/base/ui_base_api.h"
 
 namespace ui {
 
 // A base IDropSource implementation. Handles notifications sent by an active
 // drag-drop operation as the user mouses over other drop targets on their
 // system. This object tells Windows whether or not the drag should continue,
 // and supplies the appropriate cursors.
-class DragSource : public IDropSource,
-                   public base::RefCountedThreadSafe<DragSource> {
+class UI_BASE_API DragSource : public IDropSource,
+                          public base::RefCountedThreadSafe<DragSource> {

[Ben Goodger (Google), 2011/07/07 23:49:18]

indentation

  public:
   DragSource();
   virtual ~DragSource() {}
 
   // Stop the drag operation at the next chance we get.  This doesn't
   // synchronously stop the drag (since Windows is controlling that),
   // but lets us tell Windows to cancel the drag the next chance we get.
   void CancelDrag() {
     cancel_drag_ = true;
   }
@@ skipping 15 matching lines @@
  private:
   // Set to true if we want to cancel the drag operation.
   bool cancel_drag_;
 
   DISALLOW_COPY_AND_ASSIGN(DragSource);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_DRAGDROP_DRAG_SOURCE_H_