Add a handful of newly ported third_party repos

Change-Id: Ib50e484010e0f46c8660fa70f74465c5ff8e6f7d
diff --git a/scripts/gitsync/list-of-repos.txt b/scripts/gitsync/list-of-repos.txt
index 48469ce..65eaf2e 100644
--- a/scripts/gitsync/list-of-repos.txt
+++ b/scripts/gitsync/list-of-repos.txt
@@ -31,6 +31,7 @@
 third_party/gcc_none_toolchains
 third_party/gtest
 third_party/hostap
+third_party/leveldb
 third_party/libcxx
 third_party/libcxxabi
 third_party/libunwind
@@ -40,7 +41,9 @@
 third_party/lwip
 third_party/ninja
 third_party/qemu
+third_party/re2
 third_party/skia
+third_party/snappy
 third_party/zlib
 toyen
 tracing