No need to include ../tools/flags in include_dirs when depending on flags target.

gyp/pathops_unittest.gyp

 # GYP file to build unit tests.
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
     {
       'target_name': 'pathops_unittest',
       'type': 'executable',
       'suppress_wildcard': '1',
       'include_dirs' : [
         '../src/core',
         '../src/effects',
         '../src/lazy',
         '../src/pathops',
         '../src/pdf',
         '../src/pipe/utils',
         '../src/utils',
-        '../tools/',
       ],
       'includes': [
         'pathops_unittest.gypi',
       ],
       'sources': [
         '../tests/PathOpsAngleIdeas.cpp',
         '../tests/PathOpsCubicLineIntersectionIdeas.cpp',
         '../tests/PathOpsDebug.cpp',
         '../tests/PathOpsOpLoopThreadedTest.cpp',
         '../tests/PathOpsSkpClipTest.cpp',
         '../tests/Test.cpp',
+        '../tests/Test.h',
         '../tests/skia_test.cpp',
-        '../tests/Test.h',
       ],
       'dependencies': [
+        'flags.gyp:flags',
         'skia_lib.gyp:skia_lib',
-        'flags.gyp:flags',
       ],
       'conditions': [
         [ 'skia_gpu == 1', {
           'include_dirs': [
             '../src/gpu',
           ],
         }],
       ],
     },
   ],
 }