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

plugin/mac/graphics_utils_mac.mm

 /*
  * 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 14 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 
 #include "plugin/mac/graphics_utils_mac.h"
 
+namespace o3d {
+
 // Slide a window to a different rect, asynchronously, over a period of time.
 void SlideWindowToRect(WindowRef the_window,
                        CGRect destination_rect,
                        double transition_duration_seconds) {
   TransitionWindowOptions options = {0, transition_duration_seconds,
                                      NULL, NULL};
   TransitionWindowWithOptions(the_window,
                               kWindowSlideTransitionEffect,
                               kWindowMoveTransitionAction,
                               &destination_rect, true, &options);
@@ skipping 76 matching lines @@
   CGContextAddArcToPoint(context, rx, by, rx, cy, radius);
   CGContextAddArcToPoint(context, rx, ty, cx, ty, radius);
   CGContextAddArcToPoint(context, lx, ty, lx, cy, radius);
   CGContextClosePath(context);
 
   if (fill)
     CGContextFillPath(context);
   else
     CGContextStrokePath(context);
 }
+
+}  // namespace o3d