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

ui/gfx/gdi_util.h

Index: ui/gfx/gdi_util.h
===================================================================
--- ui/gfx/gdi_util.h	(revision 92815)
+++ ui/gfx/gdi_util.h	(working copy)
@@ -10,11 +10,12 @@
 #include <windows.h>
 
 #include "ui/gfx/rect.h"
+#include "ui/ui_api.h"
 
 namespace gfx {
 
 // Creates a BITMAPINFOHEADER structure given the bitmap's size.
-void CreateBitmapHeader(int width, int height, BITMAPINFOHEADER* hdr);
+UI_API void CreateBitmapHeader(int width, int height, BITMAPINFOHEADER* hdr);
 
 // Creates a BITMAPINFOHEADER structure given the bitmap's size and
 // color depth in bits per pixel.
@@ -24,14 +25,14 @@
 // Creates a BITMAPV4HEADER structure given the bitmap's size.  You probably
 // only need to use BMP V4 if you need transparency (alpha channel). This
 // function sets the AlphaMask to 0xff000000.
-void CreateBitmapV4Header(int width, int height, BITMAPV4HEADER* hdr);
+UI_API void CreateBitmapV4Header(int width, int height, BITMAPV4HEADER* hdr);
 
 // Creates a monochrome bitmap header.
 void CreateMonochromeBitmapHeader(int width, int height, BITMAPINFOHEADER* hdr);
 
 // Modify the given hrgn by subtracting the given rectangles.
-void SubtractRectanglesFromRegion(HRGN hrgn,
-                                  const std::vector<gfx::Rect>& cutouts);
+UI_API void SubtractRectanglesFromRegion(HRGN hrgn,
+                                         const std::vector<gfx::Rect>& cutouts);
 
 }  // namespace gfx