Add Sample slide for Rectanizers

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',
@@ skipping 72 matching lines @@
         '../samplecode/SampleOvalTest.cpp',
         '../samplecode/SamplePatch.cpp',
         '../samplecode/SamplePath.cpp',
         '../samplecode/SamplePathClip.cpp',
         '../samplecode/SamplePathUtils.cpp',
         '../samplecode/SamplePathEffects.cpp',
         '../samplecode/SamplePicture.cpp',
         '../samplecode/SamplePictFile.cpp',
         '../samplecode/SamplePoints.cpp',
         '../samplecode/SamplePolyToPoly.cpp',
+        '../samplecode/SampleRectanizer.cpp',
         '../samplecode/SampleRegion.cpp',
         '../samplecode/SampleRepeatTile.cpp',
         '../samplecode/SampleRotateCircles.cpp',
         '../samplecode/SampleShaders.cpp',
         '../samplecode/SampleShaderText.cpp',
         '../samplecode/SampleSkLayer.cpp',
         '../samplecode/SampleSlides.cpp',
         '../samplecode/SampleStringArt.cpp',
         '../samplecode/SampleStrokePath.cpp',
         '../samplecode/SampleSubpixelTranslate.cpp',
@@ skipping 191 matching lines @@
         }],
       ],
       'msvs_settings': {
         'VCLinkerTool': {
           'SubSystem': '2',
         },
       },
     },
   ],
 }