Adding an ECG hardware feature

Change-Id: I368772d4cd6b2713fb5180bedc91bf2b5bc015b4

data/etc/android.hardware.sensor.heartrate.ecg.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2014 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.
+-->
+
+<!-- Feature for devices with a hardware electrocardiography(ECG) sensor. -->
+<permissions>
+    <feature name="android.hardware.sensor.heartrate.ecg" />
+</permissions>