Add bootio tool to trach I/O and CPU usage during boot.

Bug: 27849529
Change-Id: I74648c8e714a3f0b249f83f17a75d48785e31f21
(cherry picked from commit da267ef9d17a028e671dc20f9174604456f82fcb)
diff --git a/tools/Android.mk b/tools/Android.mk
new file mode 100644
index 0000000..581bffd
--- /dev/null
+++ b/tools/Android.mk
@@ -0,0 +1,20 @@
+# Copyright (C) 2016 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+#
+
+LOCAL_PATH := $(call my-dir)
+
+# Include the sub-makefiles
+include $(call all-makefiles-under,$(LOCAL_PATH))