sync: add Google API Key to all ClientToServerMessages

sync/test/engine/mock_connection_manager.cc

Index: sync/test/engine/mock_connection_manager.cc
diff --git a/sync/test/engine/mock_connection_manager.cc b/sync/test/engine/mock_connection_manager.cc
index 8d03a10edb9c23a0d2dc7f608baafc9956e230d7..cc4b09cf2d4c2ebb01964341ad4db5364e57365c 100644
--- a/sync/test/engine/mock_connection_manager.cc
+++ b/sync/test/engine/mock_connection_manager.cc
@@ -82,6 +82,8 @@ bool MockConnectionManager::PostBufferToPath(PostBufferParams* params,
   ClientToServerMessage post;
   CHECK(post.ParseFromString(params->buffer_in));
   CHECK(post.has_protocol_version());
+  CHECK(post.has_api_key());
+  CHECK(post.has_bag_of_chips());
   last_request_.CopyFrom(post);
   client_stuck_ = post.sync_problem_detected();
   sync_pb::ClientToServerResponse response;