Merge "Set read file permissions for WM trace"

    void writeTraceToFile(File traceFile) throws IOException {

        synchronized (mBufferLock) {

            traceFile.delete();

            traceFile.setReadable(true, false);

            try (OutputStream os = new FileOutputStream(traceFile)) {

                traceFile.setReadable(true /* readable */, false /* ownerOnly */);

                ProtoOutputStream proto = new ProtoOutputStream();

                proto.write(MAGIC_NUMBER, MAGIC_NUMBER_VALUE);

                os.write(proto.getBytes());