Merge "WM: Don't empty Winscope traces when writing to file."

                ProtoOutputStream proto = new ProtoOutputStream();

                proto.write(MAGIC_NUMBER, MAGIC_NUMBER_VALUE);

                os.write(proto.getBytes());

                while (!mBuffer.isEmpty()) {

                    proto = mBuffer.poll();

                    mBufferUsedSize -= proto.getRawSize();

                for (ProtoOutputStream protoOutputStream : mBuffer) {

                    proto = protoOutputStream;

                    byte[] protoBytes = proto.getBytes();

                    os.write(protoBytes);

                }