Add a sketch of a test_perf script

sky/tools/skypy/paths.py

Index: sky/tools/skypy/paths.py
diff --git a/sky/tools/skypy/paths.py b/sky/tools/skypy/paths.py
new file mode 100644
index 0000000000000000000000000000000000000000..51bddc7d6280b9a8dbe39388a0ead0819e9cba3c
--- /dev/null
+++ b/sky/tools/skypy/paths.py
@@ -0,0 +1,14 @@
+# 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 os
+
+BUILD_DIRECTORY = 'out'
+CONFIG_DIRECTORY = 'Debug'
+SRC_ROOT = os.path.abspath(os.path.join(__file__,
+    os.pardir, os.pardir, os.pardir, os.pardir))
+SKY_ROOT = os.path.join(SRC_ROOT, 'sky')
+GEN_ROOT = os.path.join(SRC_ROOT, BUILD_DIRECTORY, CONFIG_DIRECTORY, 'gen')
+SKY_TOOLS_DIRECTORY = os.path.join(SRC_ROOT, 'sky', 'tools')
+MOJO_SHELL_PATH = os.path.join(SRC_ROOT, BUILD_DIRECTORY, CONFIG_DIRECTORY, 'mojo_shell')