In preparation for becoming an internal plugin in chrome I did these things:...

plugin/mac/graphics_utils_mac.h

 /*
  * Copyright 2009, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 18 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef O3D_PLUGIN_MAC_GRAPHICS_UTILS_MAC_H_
 #define O3D_PLUGIN_MAC_GRAPHICS_UTILS_MAC_H_
 
 #include <Carbon/Carbon.h>
 #include <Cocoa/Cocoa.h>
 #include <AGL/agl.h>
 
+namespace o3d {
+
 void SlideWindowToRect(WindowRef the_window,
                        CGRect destination_rect,
                        double transition_duration_seconds);
 
 void SetWindowLevel(WindowRef window, int level);
 
 bool SetWindowForAGLContext(AGLContext context, WindowRef window);
 
 bool IsMacOSTenFiveOrHigher();
 
 Rect CGRect2Rect(const CGRect &inRect);
 
 CGRect Rect2CGRect(const Rect &inRect);
 
 void PaintRoundedCGRect(CGContextRef context, CGRect rect,
                         float radius, bool fill);
 
+}  // namespace o3d
+
 #endif  //  O3D_PLUGIN_MAC_GRAPHICS_UTILS_MAC_H_