Add topic to polygerrit index paths

As part of the MCRP, we are going to add a new top level url of the
type /topic/{topicName}.

Change-Id: I24ded06a45cc1508ee9d7e732788120b7e692bdc

java/com/google/gerrit/httpd/raw/StaticModule.java

diff --git a/java/com/google/gerrit/httpd/raw/StaticModule.java b/java/com/google/gerrit/httpd/raw/StaticModule.java
index aa32169..460ad60 100644
--- a/java/com/google/gerrit/httpd/raw/StaticModule.java
+++ b/java/com/google/gerrit/httpd/raw/StaticModule.java
@@ -79,6 +79,7 @@
           "/dashboard/*",
           "/groups/self",
           "/settings/*",
+          "/topic/*",
           "/Documentation/q/*");
 
   /**