Add code to 'fix' python encoding and it's unit test.

presubmit_support.py

Index: presubmit_support.py
diff --git a/presubmit_support.py b/presubmit_support.py
index f1f70d9c4e7e832f3ab84e2ea2d4eca69994424e..e9a2dbd49763f25d93ec7ebbc325446b7d31f13f 100755
--- a/presubmit_support.py
+++ b/presubmit_support.py
@@ -50,6 +50,7 @@ except ImportError:
     import simplejson as json  # pylint: disable=F0401
 
 # Local imports.
+import fix_encoding
 import gclient_utils
 import owners
 import presubmit_canned_checks
@@ -142,18 +143,18 @@ class OutputApi(object):
     def handle(self, output):
       output.write(self._message)
       output.write('\n')
-      if len(self._items) > 0:
-        output.write('  ' + ' \\\n  '.join(map(str, self._items)) + '\n')
+      for index, item in enumerate(self._items):
+        output.write('  ')
+        # Write separately in case it's unicode.
+        output.write(item)
+        if index < len(self._items) - 1:
+          output.write(' \\')
+        output.write('\n')
       if self._long_text:
-        # Sometimes self._long_text is a ascii string, a codepage string
-        # (on windows), or a unicode object.
-        try:
-          long_text = self._long_text.decode()
-        except UnicodeDecodeError:
-          long_text = self._long_text.decode('ascii', 'replace')
-
-        output.write('\n***************\n%s\n***************\n' %
-            long_text)
+        output.write('\n***************\n')
+        # Write separately in case it's unicode.
+        output.write(self._long_text)
+        output.write('\n***************\n')
       if self.fatal:
         output.fail()
 
@@ -1192,4 +1193,5 @@ def Main(argv):
 
 
 if __name__ == '__main__':
+  fix_encoding.fix_encoding()
   sys.exit(Main(None))