QUIC - minor reorg of QuicCryptoClientStream::DoHandshakeLoop.

Added Do... methods for each state in DoHandshakeLoop (similar to the
conventions that we typically use in our state machines).

DoVerifyProof and DoGetChannelID which could do async operation
return  QuicAsyncStatus.

In DoHandshakeLoop changed "for (;;) {" to be similar to other
do { ...} while loops of other state machines in chromium.

R=rch@chromium.org,agl@chromium.org

Review URL: https://codereview.chromium.org/588443002

Cr-Commit-Position: refs/heads/master@{#297316}

net/quic/quic_crypto_client_stream.h

@@ -107,7 +107,7 @@ class NET_EXPORT_PRIVATE QuicCryptoClientStream : public QuicCryptoStream {
     STATE_GET_CHANNEL_ID_COMPLETE,
     STATE_RECV_SHLO,
     STATE_INITIALIZE_SCUP,
-    STATE_VERIFY_PROOF_DONE,
+    STATE_NONE,
   };
 
   // Handles new server config and optional source-address token provided by the
@@ -119,19 +119,41 @@ class NET_EXPORT_PRIVATE QuicCryptoClientStream : public QuicCryptoStream {
   // |in| may be NULL if the call did not result from a received message.
   void DoHandshakeLoop(const CryptoHandshakeMessage* in);
 
-  // Start the proof verification if |server_id_| is https and |cached| has
-  // signature.
-  void DoInitializeServerConfigUpdate(
-      QuicCryptoClientConfig::CachedState* cached);
+  // Start the handshake process.
+  void DoInitialize(QuicCryptoClientConfig::CachedState* cached);
 
-  // Starts the proof verification. Returns the QuicAsyncStatus returned by the
-  // ProofVerifier's VerifyProof.
+  // Send either InchoateClientHello or ClientHello message to the server.
+  void DoSendCHLO(const CryptoHandshakeMessage* in,
+                  QuicCryptoClientConfig::CachedState* cached);
+
+  // Process REJ message from the server.
+  void DoReceiveREJ(const CryptoHandshakeMessage* in,
+                    QuicCryptoClientConfig::CachedState* cached);
+
+  // Start the proof verification process. Returns the QuicAsyncStatus returned
+  // by the ProofVerifier's VerifyProof.
   QuicAsyncStatus DoVerifyProof(QuicCryptoClientConfig::CachedState* cached);
 
   // If proof is valid then it sets the proof as valid (which persists the
-  // server config) and returns QUIC_NO_ERROR. If not, it closes the connection
-  // and returns QUIC_PROOF_INVALID.
-  QuicErrorCode DoVerifyProofComplete(
+  // server config). If not, it closes the connection.
+  void DoVerifyProofComplete(QuicCryptoClientConfig::CachedState* cached);
+
+  // Start the look up of Channel ID process. Returns either QUIC_SUCCESS if
+  // RequiresChannelID returns false or QuicAsyncStatus returned by
+  // GetChannelIDKey.
+  QuicAsyncStatus DoGetChannelID(QuicCryptoClientConfig::CachedState* cached);
+
+  // If there is no channel ID, then close the connection otherwise transtion to
+  // STATE_SEND_CHLO state.
+  void DoGetChannelIDComplete();
+
+  // Process SHLO message from the server.
+  void DoReceiveSHLO(const CryptoHandshakeMessage* in,
+                     QuicCryptoClientConfig::CachedState* cached);
+
+  // Start the proof verification if |server_id_| is https and |cached| has
+  // signature.
+  void DoInitializeServerConfigUpdate(
       QuicCryptoClientConfig::CachedState* cached);
 
   // Called to set the proof of |cached| valid.  Also invokes the session's