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

ui/gfx/path.h

 // Copyright (c) 2009 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_GFX_PATH_H_
 #define UI_GFX_PATH_H_
 #pragma once
 
 #include "base/basictypes.h"
+#include "third_party/skia/include/core/SkPath.h"
 #include "ui/gfx/native_widget_types.h"
-
-#include "third_party/skia/include/core/SkPath.h"
+#include "ui/ui_api.h"
 
 namespace gfx {
 
-class Path : public SkPath {
+class UI_API Path : public SkPath {
  public:
   // Used by Path(Point,size_t) constructor.
   struct Point {
     int x;
     int y;
   };
 
   Path();
 
   // Creates a path populated with the specified points.
@@ skipping 21 matching lines @@
                                           gfx::NativeRegion r2);
 #endif
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Path);
 };
 
 }
 
 #endif  // UI_GFX_PATH_H_