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

plugin/mac/graphics_utils_mac.mm

Index: plugin/mac/graphics_utils_mac.mm
===================================================================
--- plugin/mac/graphics_utils_mac.mm	(revision 20106)
+++ plugin/mac/graphics_utils_mac.mm	(working copy)
@@ -32,6 +32,8 @@
 
 #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,
@@ -128,3 +130,5 @@
   else
     CGContextStrokePath(context);
 }
+
+}  // namespace o3d