LogServlet: factor out Paginator creation

Change-Id: Iff57817e6d545d529f9654fa1a8b16ffa780f3b5

gitiles-servlet/src/main/java/com/google/gitiles/Paginator.java

diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/Paginator.java b/gitiles-servlet/src/main/java/com/google/gitiles/Paginator.java
index 0454556..62dfb55 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/Paginator.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/Paginator.java
@@ -162,6 +162,14 @@
     };
   }
 
+  public int getLimit() {
+    return limit;
+  }
+
+  public RevWalk getWalk() {
+    return walk;
+  }
+
   private RevCommit nextUnchecked() {
     try {
       return next();