Return SDK deps as additional proto field

BUG=None
TEST=manually ran endpoint

Change-Id: Ia177a37bda28d8d9e7005c862ad6a6ef753864e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/1931294
Tested-by: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
diff --git a/api/controller/dependency_unittest.py b/api/controller/dependency_unittest.py
index 1ec664e..c0412ed 100644
--- a/api/controller/dependency_unittest.py
+++ b/api/controller/dependency_unittest.py
@@ -80,9 +80,10 @@
 
   def testGetBuildDependencyGraph(self):
     """GetBuildDependencyGraph calls helper method with correct args."""
-    patch = self.PatchObject(dependency_service,
-                             'GetBuildDependency',
-                             return_value=self.json_deps)
+    patch = self.PatchObject(
+        dependency_service,
+        'GetBuildDependency',
+        return_value=(self.json_deps, self.json_deps))
     input_proto = depgraph_pb2.GetBuildDependencyGraphRequest()
     input_proto.build_target.name = 'target'
     dependency.GetBuildDependencyGraph(input_proto, self.response,