Codegen paths from python for the arm and build the graph

We now have a bunch of really cool paths in C++.  They look pretty good.

Change-Id: I9590d771cebc64cd520ceed2617aca8a82f78362
diff --git a/y2018/control_loops/superstructure/arm/BUILD b/y2018/control_loops/superstructure/arm/BUILD
index 997d940..af1e03a 100644
--- a/y2018/control_loops/superstructure/arm/BUILD
+++ b/y2018/control_loops/superstructure/arm/BUILD
@@ -74,8 +74,8 @@
     ],
     restricted_to = ["//tools:k8"],
     deps = [
-        ":demo_path",
         ":ekf",
+        ":generated_graph",
         ":trajectory",
         "//third_party/eigen",
         "//third_party/gflags",
@@ -126,6 +126,7 @@
     deps = [
         ":demo_path",
         ":ekf",
+        ":generated_graph",
         ":graph",
         ":trajectory",
         "//aos/common/logging:queue_logging",
@@ -134,3 +135,27 @@
         "//y2018/control_loops/superstructure:superstructure_queue",
     ],
 )
+
+genrule(
+    name = "generated_graph_genrule",
+    outs = [
+        "generated_graph.h",
+        "generated_graph.cc",
+    ],
+    cmd = "$(location //y2018/control_loops/python:graph_codegen) $(OUTS)",
+    tools = [
+        "//y2018/control_loops/python:graph_codegen",
+    ],
+)
+
+cc_library(
+    name = "generated_graph",
+    srcs = [
+        "generated_graph.cc",
+    ],
+    hdrs = ["generated_graph.h"],
+    deps = [
+        ":graph",
+        ":trajectory",
+    ],
+)