Add a setTimer() function.

gyp/v8.gyp

 # GYP file to build a V8 sample.
 {
   'targets': [
     {
       'target_name': 'SkV8Example',
       'type': 'executable',
       'mac_bundle' : 1,
       'include_dirs' : [
         '../tools/flags',
         '../../../v8/include',
         ],
       'includes': [],
        'sources': [
          '../experimental/SkV8Example/SkV8Example.h',
          '../experimental/SkV8Example/SkV8Example.cpp',
+         '../experimental/SkV8Example/Global.h',
+         '../experimental/SkV8Example/Global.cpp',
        ],
        'dependencies': [
          'skia_lib.gyp:skia_lib',
          'views.gyp:views',
          'xml.gyp:xml',
          'flags.gyp:flags',
        ],
 
         'link_settings': {
           'libraries': [
@@ skipping 56 matching lines @@
         },
         'mac_bundle_resources' : [
           '../experimental/SkiaExamples/SkiaExamples.xib'
           ],
         }
       ],
      ],
     }
   ],
 }