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

ui/gfx/gtk_util.h

Index: ui/gfx/gtk_util.h
===================================================================
--- ui/gfx/gtk_util.h	(revision 92815)
+++ ui/gfx/gtk_util.h	(working copy)
@@ -13,6 +13,7 @@
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
+#include "ui/ui_api.h"
 
 typedef struct _GdkPixbuf GdkPixbuf;
 typedef struct _GdkRegion GdkRegion;
@@ -28,16 +29,16 @@
 // Call gtk_init() using the argc and argv from command_line.
 // gtk_init() wants an argc and argv that it can mutate; we provide those,
 // but leave the original CommandLine unaltered.
-void GtkInitFromCommandLine(const CommandLine& command_line);
+UI_API void GtkInitFromCommandLine(const CommandLine& command_line);
 
 // Convert and copy a SkBitmap to a GdkPixbuf. NOTE: this uses BGRAToRGBA, so
 // it is an expensive operation.  The returned GdkPixbuf will have a refcount of
 // 1, and the caller is responsible for unrefing it when done.
-GdkPixbuf* GdkPixbufFromSkBitmap(const SkBitmap* bitmap);
+UI_API GdkPixbuf* GdkPixbufFromSkBitmap(const SkBitmap* bitmap);
 
 // Modify the given region by subtracting the given rectangles.
-void SubtractRectanglesFromRegion(GdkRegion* region,
-                                  const std::vector<Rect>& cutouts);
+UI_API void SubtractRectanglesFromRegion(GdkRegion* region,
+                                         const std::vector<Rect>& cutouts);
 
 // Returns the resolution (DPI) used by pango. A negative values means the
 // resolution hasn't been set.
@@ -45,14 +46,15 @@
 
 // Returns a static instance of a GdkCursor* object, sharable across the
 // process. Caller must gdk_cursor_ref() it if they want to assume ownership.
-GdkCursor* GetCursor(int type);
+UI_API GdkCursor* GetCursor(int type);
 
 // Change windows accelerator style to GTK style. (GTK uses _ for
 // accelerators.  Windows uses & with && as an escape for &.)
-std::string ConvertAcceleratorsFromWindowsStyle(const std::string& label);
+UI_API std::string ConvertAcceleratorsFromWindowsStyle(
+    const std::string& label);
 
 // Removes the "&" accelerators from a Windows label.
-std::string RemoveWindowsStyleAccelerators(const std::string& label);
+UI_API std::string RemoveWindowsStyleAccelerators(const std::string& label);
 
 // Makes a copy of |pixels| with the ordering changed from BGRA to RGBA.
 // The caller is responsible for free()ing the data. If |stride| is 0, it's