Add android.software.webview software feature.

Some devices may ship without a working WebView implementation. This
system feature will be present on devices that support a
functional WebView.

Bug: 13438487
Change-Id: I1f72756196661dca01614e124895522b60e52493

Author: Ben Murdoch

data/etc/android.software.webview.xml

@@ -0,0 +1,19 @@
+<?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.
+-->
+
+<permissions>
+    <feature name="android.software.webview" />
+</permissions>