Add transport security state generator tests.

net/tools/transport_security_state_generator/bit_writer.cc

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/tools/transport_security_state_generator/bit_writer.h"
 
 #include "base/logging.h"
 
 namespace net {
 
@@ skipping 15 matching lines @@
   current_byte_ |= bit << (7 - used_);
   used_++;
   position_++;
 
   if (used_ == 8) {
     Flush();
   }
 }
 
 void BitWriter::Flush() {
+  position_ += (8 - used_);
   bytes_.push_back(current_byte_);
 
   used_ = 0;
   current_byte_ = 0;
 }
 
-uint8_t BitWriter::BitLength(uint32_t input) const {
-  uint8_t number_of_bits = 0;
-  while (input != 0) {
-    number_of_bits++;
-    input >>= 1;
-  }
-  return number_of_bits;
-}
-
 }  // namespace transport_security_state
 
 }  // namespace net