Add Clock Sample.

gyp/SampleApp.gyp

 {
   'variables': {
     #manually set sample_pdf_file_viewer to 1 to have the PdfViewer in SampleApp
     'sample_pdf_file_viewer%': 0,
   },
   'targets': [
     {
       'target_name': 'SampleApp',
       'type': 'executable',
       'mac_bundle' : 1,
@@ skipping 33 matching lines @@
         '../samplecode/SampleApp.cpp',
         '../samplecode/SampleArc.cpp',
         '../samplecode/SampleAvoid.cpp',
         '../samplecode/SampleBigBlur.cpp',
         '../samplecode/SampleBigGradient.cpp',
         '../samplecode/SampleBitmapRect.cpp',
         '../samplecode/SampleBlur.cpp',
         '../samplecode/SampleCamera.cpp',
         '../samplecode/SampleChart.cpp',
         '../samplecode/SampleCircle.cpp',
+        '../samplecode/SampleClock.cpp',
         '../samplecode/SampleClip.cpp',
         '../samplecode/SampleCode.h',
         '../samplecode/SampleColorFilter.cpp',
         '../samplecode/SampleComplexClip.cpp',
         '../samplecode/SampleConcavePaths.cpp',
         '../samplecode/SampleCull.cpp',
         '../samplecode/SampleDegenerateTwoPtRadials.cpp',
         '../samplecode/SampleDither.cpp',
         '../samplecode/SampleDitherBitmap.cpp',
         '../samplecode/SampleEffects.cpp',
@@ skipping 253 matching lines @@
       },
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: