Added function to get native path case on Windows and OSX.

tools/isolate/trace_inputs_smoke_test.py

Index: tools/isolate/trace_inputs_smoke_test.py
diff --git a/tools/isolate/trace_inputs_smoke_test.py b/tools/isolate/trace_inputs_smoke_test.py
index acdbc3c9cb0f11de2b748e658366b47f54c12eac..b6496a36ee5625f51d3d98ef50c506190c18869f 100755
--- a/tools/isolate/trace_inputs_smoke_test.py
+++ b/tools/isolate/trace_inputs_smoke_test.py
@@ -32,12 +32,15 @@ class CalledProcessError(subprocess.CalledProcessError):
 
 class TraceInputs(unittest.TestCase):
   def setUp(self):
-    self.tempdir = tempfile.mkdtemp()
+    self.tempdir = tempfile.mkdtemp(prefix='trace_smoke_test')
     self.log = os.path.join(self.tempdir, 'log')
     os.chdir(ROOT_DIR)
 
   def tearDown(self):
-    shutil.rmtree(self.tempdir)
+    if VERBOSE:
+      print 'Leaking: %s' % self.tempdir
+    else:
+      shutil.rmtree(self.tempdir)
 
   def _execute(self, is_gyp):
     cmd = [