Make more tests pass on Windows.

PRESUBMIT.py

Index: PRESUBMIT.py
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 3002447e4f516c28450198dfb82432772fb0727b..a3aad5061884ce6b30e6984df9e4c49fb59e8862 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -51,6 +51,10 @@ def CommonChecks(input_api, output_api):
 def RunGitClTests(input_api, output_api, verbose):
   """Run all the shells scripts in the directory test.
   """
+  if input_api.platform == 'win32':
+    # Skip for now as long as the test scripts are bash scripts.
+    return []
+
   # First loads a local Rietveld instance.
   import sys
   old_sys_path = sys.path