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

ui/gfx/skia_util.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_GFX_SKIA_UTIL_H_
 #define UI_GFX_SKIA_UTIL_H_
 #pragma once
 
 #include <string>
 
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkRect.h"
+#include "ui/ui_api.h"
 
 class SkBitmap;
 class SkShader;
 
 namespace gfx {
 
 class Rect;
 
 // Convert between Skia and gfx rect types.
-SkRect RectToSkRect(const gfx::Rect& rect);
-gfx::Rect SkRectToRect(const SkRect& rect);
+UI_API SkRect RectToSkRect(const gfx::Rect& rect);
+UI_API gfx::Rect SkRectToRect(const SkRect& rect);
 
 // Creates a vertical gradient shader. The caller owns the shader.
 // Example usage to avoid leaks:
 //   SkSafeUnref(paint.setShader(gfx::CreateGradientShader(0, 10, red, blue)));
 //
 // (The old shader in the paint, if any, needs to be freed, and SkSafeUnref will
 // handle the NULL case.)
-SkShader* CreateGradientShader(int start_point,
-                               int end_point,
-                               SkColor start_color,
-                               SkColor end_color);
+UI_API SkShader* CreateGradientShader(int start_point,
+                                      int end_point,
+                                      SkColor start_color,
+                                      SkColor end_color);
 
 // Returns true if the two bitmaps contain the same pixels.
-bool BitmapsAreEqual(const SkBitmap& bitmap1, const SkBitmap& bitmap2);
+UI_API bool BitmapsAreEqual(const SkBitmap& bitmap1, const SkBitmap& bitmap2);
 
 // Strip the accelerator char (typically '&') from a menu string.  A
 // double accelerator char ('&&') will be converted to a single char.
-std::string RemoveAcceleratorChar(const std::string& s, char accelerator_char);
+UI_API std::string RemoveAcceleratorChar(const std::string& s,
+                                         char accelerator_char);
 
 }  // namespace gfx;
 
 #endif  // UI_GFX_SKIA_UTIL_H_