Move persistent data to /data/vendor.

Widevine persistent data is stored in /data/mediadrm, HALs
are not allowed to access files in /data. Move persistent
data to /data/vendor/mediadrm/widevine for older devices,
and persistent data will not be saved under /data/vendor.

Test: Play Movies & Tv, Netflix

bug: 36601695
Change-Id: I31fdd43b7db327bf6d8343dc95e9883ae6bce70d

libwvdrmengine/move_widevine_data.sh

@@ -0,0 +1,21 @@
+#!/system/bin/sh
+
+DEST_PATH="/data/vendor/mediadrm"
+FILES_MOVED="/data/vendor/mediadrm/files_moved"
+SRC_PATH="/data/mediadrm"
+
+if [ ! -f "$FILES_MOVED" ]; then
+  for i in "$SRC_PATH/IDM"*; do
+    dest_path=$DEST_PATH/"${i#$SRC_PATH/}"
+    if [ -d "$i" ]; then
+      mkdir -p $dest_path -m 700
+      mv $i "$DEST_PATH"
+      find $dest_path -print0 | while IFS= read -r -d '' file
+        do
+          chgrp media "$file"
+        done
+    fi
+  done
+  restorecon -R "$DEST_PATH"
+  echo 1 > "$FILES_MOVED"
+fi