Update chrome_tests.sh to run DrMemory from Cygwin

tools/valgrind/valgrind_test.py

Index: tools/valgrind/valgrind_test.py
===================================================================
--- tools/valgrind/valgrind_test.py	(revision 109423)
+++ tools/valgrind/valgrind_test.py	(working copy)
@@ -798,7 +798,7 @@
     for suppression_file in self._options.suppressions:
       if os.path.exists(suppression_file):
         suppression_count += 1
-        proc += ["-suppress", suppression_file]
+        proc += ["-suppress", common.NormalizeWindowsPath(suppression_file)]
 
     if not suppression_count:
       logging.warning("WARNING: NOT USING SUPPRESSIONS!")
@@ -812,7 +812,7 @@
     if self._options.use_debug:
       proc += ["-debug"]
 
-    proc += ["-logdir", self.log_dir]
+    proc += ["-logdir", common.NormalizeWindowsPath(self.log_dir)]
     proc += ["-batch", "-quiet", "-no_results_to_stderr"]
 
     proc += ["-callstack_max_frames", "40"]
@@ -840,6 +840,7 @@
       proc = []
 
     # Note that self._args begins with the name of the exe to be run.
+    self._args[0] = common.NormalizeWindowsPath(self._args[0])
     proc += self._args
     return proc