Add path utils, plus a test for it.

gyp/SampleApp.gyp

+# GYP for building SampleApp.
 {
   'targets': [
     {
       'target_name': 'SampleApp',
       'type': 'executable',
       'mac_bundle' : 1,
       'include_dirs' : [
         '../debugger',
         '../src/core',
         '../src/effects', #needed for BlurMask.h
@@ skipping 127 matching lines @@
       ],
       'dependencies': [
         'skia_base_libs.gyp:skia_base_libs',
         'effects.gyp:effects',
         'images.gyp:images',
         'views.gyp:views',
         'animator.gyp:animator',
         'xml.gyp:xml',
         'experimental.gyp:experimental',
         'pdf.gyp:pdf',
+        'utils.gyp:utils',
         'views_animated.gyp:views_animated',
       ],
       'conditions' : [
        [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris"]', {
          'sources!': [
             '../samplecode/SampleDecode.cpp',
          ],
         }],
         [ 'skia_os == "win"', {
           'sources!': [
@@ skipping 145 matching lines @@
       },
     },
   ],
 }
 
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