Create HTTP-based GM results viewer.

tools/svn.py

Index: tools/svn.py
===================================================================
--- tools/svn.py	(revision 11476)
+++ tools/svn.py	(working copy)
@@ -85,6 +85,15 @@
         """
         return self._RunCommand([SVN, 'checkout', url, path])
 
+    def Update(self, path):
+        """Update the working copy.
+        Returns stdout as a single string.
+
+        @param path path (within self._directory) within which to run
+        "svn update"
+        """
+        return self._RunCommand([SVN, 'update', path])
+
     def ListSubdirs(self, url):
         """Returns a list of all subdirectories (not files) within a given SVN
         url.