Make Timur's recent drmemory script changes work on Cygwin.

tools/valgrind/valgrind_test.py

 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Runs an exe through Valgrind and puts the intermediate files in a
 directory.
 """
 
 import datetime
 import glob
@@ skipping 843 matching lines @@
       # The other case is only possible with -t cmdline.
       # Anyways, if we omit -symcache_dir the -logdir's value is used which
       # should be fine.
       symcache_dir = os.path.join(self._options.build_dir, "drmemory.symcache")
       if not os.path.exists(symcache_dir):
         try:
           os.mkdir(symcache_dir)
         except OSError:
           logging.warning("Can't create symcache dir?")
       if os.path.exists(symcache_dir):
-        proc += ["-symcache_dir", symcache_dir]
+        proc += ["-symcache_dir", common.NormalizeWindowsPath(symcache_dir)]
 
     # Use -no_summary to suppress DrMemory's summary and init-time
     # notifications.  We generate our own with drmemory_analyze.py.
     proc += ["-batch", "-no_summary"]
 
     # Un-comment to disable interleaved output.  Will also suppress error
     # messages normally printed to stderr.
     #proc += ["-quiet", "-no_results_to_stderr"]
 
     proc += ["-callstack_max_frames", "40"]
@@ skipping 323 matching lines @@
       return Asan()
     try:
       platform_name = common.PlatformNames()[0]
     except common.NotImplementedError:
       platform_name = sys.platform + "(Unknown)"
     raise RuntimeError, "Unknown tool (tool=%s, platform=%s)" % (tool_name,
                                                                  platform_name)
 
 def CreateTool(tool):
   return ToolFactory().Create(tool)