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

ui/gfx/point.h

 // Copyright (c) 2010 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_POINT_H_
 #define UI_GFX_POINT_H_
 #pragma once
 
 #include "build/build_config.h"
 
 #include <iosfwd>
 
+#include "ui/ui_api.h"
+
 #if defined(OS_WIN)
 typedef unsigned long DWORD;
 typedef struct tagPOINT POINT;
 #elif defined(OS_MACOSX)
 #include <ApplicationServices/ApplicationServices.h>
 #endif
 
 namespace gfx {
 
 // A point has an x and y coordinate.
-class Point {
+class UI_API Point {
  public:
   Point();
   Point(int x, int y);
 #if defined(OS_WIN)
   // |point| is a DWORD value that contains a coordinate.  The x-coordinate is
   // the low-order short and the y-coordinate is the high-order short.  This
   // value is commonly acquired from GetMessagePos/GetCursorPos.
   explicit Point(DWORD point);
   explicit Point(const POINT& point);
   Point& operator=(const POINT& point);
@@ skipping 53 matching lines @@
   POINT ToPOINT() const;
 #elif defined(OS_MACOSX)
   CGPoint ToCGPoint() const;
 #endif
 
  private:
   int x_;
   int y_;
 };
 
-std::ostream& operator<<(std::ostream& out, const gfx::Point& p);
+UI_API std::ostream& operator<<(std::ostream& out, const gfx::Point& p);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_POINT_H_