Finish issue #2271640: Fix wallpaper etc docs

Publish the live wallpaper feature if they are supported.
diff --git a/Android.mk b/Android.mk
index 0f3dbcd..a682ef3 100644
--- a/Android.mk
+++ b/Android.mk
@@ -15,11 +15,31 @@
 #
 
 LOCAL_PATH := $(call my-dir)
+
+########################
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := android.software.live_wallpaper.xml
+
+LOCAL_MODULE_TAGS := user
+
+LOCAL_MODULE_CLASS := ETC
+
+# This will install the file in /system/etc/permissions
+#
+LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/permissions
+
+LOCAL_SRC_FILES := $(LOCAL_MODULE)
+
+include $(BUILD_PREBUILT)
+
+########################
 include $(CLEAR_VARS)
 
 #LOCAL_MODULE_TAGS := user
 
 LOCAL_SRC_FILES := $(call all-subdir-java-files)
+LOCAL_REQUIRES_MODULE := android.software.live_wallpaper.xml
 
 LOCAL_PACKAGE_NAME := LiveWallpapersPicker
 LOCAL_CERTIFICATE := platform
diff --git a/android.software.live_wallpaper.xml b/android.software.live_wallpaper.xml
new file mode 100644
index 0000000..bf2b12d
--- /dev/null
+++ b/android.software.live_wallpaper.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2009 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.
+-->
+
+<!-- This feature should be defined for devices that support live wallpapers.
+     There are minimum hardware requirements to be able to support this
+     feature: robust multiple GL context support, fast enough CPU, enough
+     RAM to allow the wallpaper to be running all of the time. -->
+<permissions>
+    <feature name="android.software.live_wallpaper" />
+</permissions>