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

ui/gfx/canvas_skia.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_CANVAS_SKIA_H_
 #define UI_GFX_CANVAS_SKIA_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/string16.h"
@@ skipping 16 matching lines @@
 // end with Int. If you need to use methods provided by the superclass
 // you'll need to do a conversion. In particular you'll need to use
 // macro SkIntToScalar(xxx), or if converting from a scalar to an integer
 // SkScalarRound.
 //
 // A handful of methods in this class are overloaded providing an additional
 // argument of type SkXfermode::Mode. SkXfermode::Mode specifies how the
 // source and destination colors are combined. Unless otherwise specified,
 // the variant that does not take a SkXfermode::Mode uses a transfer mode
 // of kSrcOver_Mode.
-class CanvasSkia : public skia::PlatformCanvas,
-                   public Canvas {
+class UI_API CanvasSkia : public skia::PlatformCanvas, public Canvas {
  public:
   enum TruncateFadeMode {
     TruncateFadeTail,
     TruncateFadeHead,
     TruncateFadeHeadAndTail,
   };
 
   // Creates an empty Canvas. Callers must use initialize before using the
   // canvas.
   CanvasSkia();
@@ skipping 128 matching lines @@
                      int x, int y, int w, int h,
                      int flags);
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(CanvasSkia);
 };
 
 }  // namespace gfx;
 
 #endif  // UI_GFX_CANVAS_SKIA_H_