Core mojo API for python.

mojo/public/python/BUILD.gn

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//third_party/cython/rules.gni")
+
+group("python") {
+  deps = [
+    ":base",
+    ":system",
+  ]
+}
+
+python_binary_module("system") {
+  python_base_module = "mojo"
+  sources = [
+    "mojo/c_core.pxd",
+    "mojo/system.pyx",
+  ]
+  deps = [
+    "//mojo/public/c/system",
+    ":base",
+  ]
+}
+
+copy("base") {
+  sources = [
+    "mojo/__init__.py",
+  ]
+  outputs = [
+    "$root_out_dir/python/mojo/__init__.py",
+  ]
+}