Prevent modifying path separator on Windows by shlex.split()

tools/bisect-perf-regression.py

Index: tools/bisect-perf-regression.py
diff --git a/tools/bisect-perf-regression.py b/tools/bisect-perf-regression.py
index e5a615e68d332232fc042eafc00c1192568d224b..c0eccf354e8cc0b32822acc4f887f15ad00a3f62 100755
--- a/tools/bisect-perf-regression.py
+++ b/tools/bisect-perf-regression.py
@@ -2094,7 +2094,10 @@ class BisectPerformanceMetrics(object):
       }
       return (fake_results, success_code)
 
-    args = shlex.split(command_to_run)
+    # For Windows platform set posix=False, to parse windows paths correctly.
+    # On Windows, path separators '\' or '\\' are replace by '' when posix=True,
+    # refer to http://bugs.python.org/issue1724822. By default posix=True.
+    args = shlex.split(command_to_run, posix=not IsWindows())
 
     if not self._GenerateProfileIfNecessary(args):
       err_text = 'Failed to generate profile for performance test.'