experiment with -Wimplicit-fallthrough

net/quic/crypto/crypto_framer.cc

Index: net/quic/crypto/crypto_framer.cc
diff --git a/net/quic/crypto/crypto_framer.cc b/net/quic/crypto/crypto_framer.cc
index dd5d24f9ae2f1e6d3f093ff8930167d80875f8ff..fe5206f9435a28b3080a0cb9a156d25dead4251e 100644
--- a/net/quic/crypto/crypto_framer.cc
+++ b/net/quic/crypto/crypto_framer.cc
@@ -208,6 +208,7 @@ QuicErrorCode CryptoFramer::Process(StringPiece input) {
       reader.ReadUInt32(&message_tag);
       message_.set_tag(message_tag);
       state_ = STATE_READING_NUM_ENTRIES;
+      FALLTHROUGH_INTENDED;
     case STATE_READING_NUM_ENTRIES:
       if (reader.BytesRemaining() < kNumEntriesSize + sizeof(uint16)) {
         break;
@@ -222,6 +223,7 @@ QuicErrorCode CryptoFramer::Process(StringPiece input) {
       tags_and_lengths_.reserve(num_entries_);
       state_ = STATE_READING_TAGS_AND_LENGTHS;
       values_len_ = 0;
+      FALLTHROUGH_INTENDED;
     case STATE_READING_TAGS_AND_LENGTHS: {
       if (reader.BytesRemaining() <
               num_entries_ * (kQuicTagSize + kCryptoEndOffsetSize)) {
@@ -251,6 +253,7 @@ QuicErrorCode CryptoFramer::Process(StringPiece input) {
       }
       values_len_ = last_end_offset;
       state_ = STATE_READING_VALUES;
+      FALLTHROUGH_INTENDED;
     }
     case STATE_READING_VALUES:
       if (reader.BytesRemaining() < values_len_) {