Add normal map sample

gyp/SampleApp.gyp

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'variables': {
@@ skipping 68 matching lines @@
         '../samplecode/SampleFuzz.cpp',
         '../samplecode/SampleGradients.cpp',
         '../samplecode/SampleHairCurves.cpp',
         '../samplecode/SampleHairline.cpp',
         '../samplecode/SampleHairModes.cpp',
         '../samplecode/SampleHT.cpp',
         '../samplecode/SampleIdentityScale.cpp',
         '../samplecode/SampleLayerMask.cpp',
         '../samplecode/SampleLayers.cpp',
         '../samplecode/SampleLCD.cpp',
+        '../samplecode/SampleLighting.cpp',
         '../samplecode/SampleLines.cpp',
         '../samplecode/SampleLua.cpp',
         '../samplecode/SampleManyRects.cpp',
         '../samplecode/SampleMeasure.cpp',
         '../samplecode/SamplePatch.cpp',
         '../samplecode/SamplePath.cpp',
         '../samplecode/SamplePathClip.cpp',
         '../samplecode/SamplePathFuzz.cpp',
         '../samplecode/SamplePathEffects.cpp',
         '../samplecode/SamplePicture.cpp',
@@ skipping 162 matching lines @@
         }],
         [ 'skia_gpu == 1', {
           'dependencies': [
             'gputest.gyp:skgputest',
           ],
         }],
       ],
     },
   ],
 }