Wire up /batches in skiaserve

tools/skiaserve/urlhandlers/UrlHandler.h

Index: tools/skiaserve/urlhandlers/UrlHandler.h
diff --git a/tools/skiaserve/urlhandlers/UrlHandler.h b/tools/skiaserve/urlhandlers/UrlHandler.h
index 9eee35f489bdbd186d5bfc4ff3ad93a4f93b0100..28d378aaf98355a47f98d4f18967ef793f67ff55 100644
--- a/tools/skiaserve/urlhandlers/UrlHandler.h
+++ b/tools/skiaserve/urlhandlers/UrlHandler.h
@@ -101,6 +101,17 @@ public:
                const char* upload_data, size_t* upload_data_size) override;
 };
 
+/*
+ * Returns a json descripton of all the batches in the image
+ */
+class BatchesHandler : public UrlHandler {
+public:
+    bool canHandle(const char* method, const char* url) override;
+    int handle(Request* request, MHD_Connection* connection,
+               const char* url, const char* method,
+               const char* upload_data, size_t* upload_data_size) override;
+};
+
 class RootHandler : public UrlHandler {
 public:
     bool canHandle(const char* method, const char* url) override;