Add normal map sample

gyp/SampleApp.gyp

Index: gyp/SampleApp.gyp
diff --git a/gyp/SampleApp.gyp b/gyp/SampleApp.gyp
index 7ccda936195fb279223b2390bf4448c34472c5dd..a1519e5f541438f1806222c0903d65f9d3eec96d 100644
--- a/gyp/SampleApp.gyp
+++ b/gyp/SampleApp.gyp
@@ -86,6 +86,7 @@
         '../samplecode/SampleLayerMask.cpp',
         '../samplecode/SampleLayers.cpp',
         '../samplecode/SampleLCD.cpp',
+	'../samplecode/SampleLighting.cpp',
         '../samplecode/SampleLines.cpp',
         '../samplecode/SampleLua.cpp',
         '../samplecode/SampleManyRects.cpp',
@@ -259,6 +260,11 @@
             'android_deps.gyp:Android_SampleApp',
           ],
         }],
+	[ 'skia_os == "chromeos"', {
+	  'sources!': [
+	    '../samplecode/SampleLighting.cpp',  #doesn't compile due to gpu dependencies
+          ],
+        }],
         [ 'skia_gpu == 1', {
           'dependencies': [
             'gputest.gyp:skgputest',