Add noop rule to BUILD to import init file correctly on g3

Change-Id: I32d8f228891a5189fcf8c4926f7d82d949685057
diff --git a/BUILD.extras b/BUILD.extras
index 825120a..1fc4f9f 100644
--- a/BUILD.extras
+++ b/BUILD.extras
@@ -87,6 +87,11 @@
     srcs = [],
 )
 
+perfetto_py_library(
+    name = "trace_processor_init_noop",
+    srcs = [],
+)
+
 perfetto_py_binary(
     name = "trace_processor_py_example",
     srcs = ["src/trace_processor/python/example.py"],
@@ -97,8 +102,9 @@
 
 perfetto_py_library(
     name = "trace_processor_py",
-    srcs = glob(['src/trace_processor/python/trace_processor/*.py']),
+    srcs = glob(["src/trace_processor/python/trace_processor/*.py"]),
     data = [
+        ":trace_processor_init_noop",
         "src/trace_processor/python/trace_processor/trace_processor.descriptor",
         "src/trace_processor/python/trace_processor/metrics.descriptor",
         ":trace_processor_shell",