Bazel: Add workspace file for in gerrit tree build

Append the content of WORKSPACE.in_gerrit_tree file to WORKSPACE file
in gerrit tree to build this plugin in gerrit tree mode:

  cd plugins/
  ln -s ../../gerrit-oauth-provider .
  cat ../gerrit-oauth-provider/WORKSPACE.in_gerrit_tree >> WORKSPACE
  bazel build plugins/gerrit-oauth-provider
  INFO: Found 1 target...
Target //plugins/gerrit-oauth-provider:gerrit-oauth-provider up-to-date:
  bazel-genfiles/plugins/gerrit-oauth-provider/gerrit-oauth-provider.jar
INFO: Elapsed time: 0.652s, Critical Path: 0.52s

Change-Id: Ie351478dfb7846659f161d9c8de672319cb3fa47
diff --git a/WORKSPACE.in_gerrit_tree b/WORKSPACE.in_gerrit_tree
new file mode 100644
index 0000000..e6f30b9
--- /dev/null
+++ b/WORKSPACE.in_gerrit_tree
@@ -0,0 +1,7 @@
+
+maven_jar(
+    name = "scribe",
+    artifact = "org.scribe:scribe:1.3.7",
+    sha1 = "583921bed46635d9f529ef5f14f7c9e83367bc6e",
+)
+