Add transport security state generator tests.

net/tools/transport_security_state_generator/bit_writer.cc

Index: net/tools/transport_security_state_generator/bit_writer.cc
diff --git a/net/tools/transport_security_state_generator/bit_writer.cc b/net/tools/transport_security_state_generator/bit_writer.cc
index b10316d241c5b394682d391b8f5cc9d1fee89fe0..82da76a65d43bf9cb0dcd5903fa3d3c2e131dc70 100644
--- a/net/tools/transport_security_state_generator/bit_writer.cc
+++ b/net/tools/transport_security_state_generator/bit_writer.cc
@@ -33,21 +33,13 @@ void BitWriter::WriteBit(uint8_t bit) {
 }
 
 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