Add better help information to quic_client and quic_server. Also,

net/tools/quic/quic_client.h

Index: net/tools/quic/quic_client.h
diff --git a/net/tools/quic/quic_client.h b/net/tools/quic/quic_client.h
index 8146764bab93f60624a2b9518487ef7336016901..88268159e4ef713b26538903347980be27b7c6aa 100644
--- a/net/tools/quic/quic_client.h
+++ b/net/tools/quic/quic_client.h
@@ -34,10 +34,13 @@ namespace test {
 class QuicClientPeer;
 }  // namespace test
 
-class QuicClient : public EpollCallbackInterface {
+class QuicClient : public EpollCallbackInterface,
+                   public ReliableQuicStream::Visitor {
  public:
-  QuicClient(IPEndPoint server_address, const std::string& server_hostname,
-             const QuicVersion version);
+  QuicClient(IPEndPoint server_address,
+             const string& server_hostname,
+             const QuicVersion version,
+             bool print_response);
   QuicClient(IPEndPoint server_address,
              const std::string& server_hostname,
              const QuicConfig& config,
@@ -96,6 +99,9 @@ class QuicClient : public EpollCallbackInterface {
   virtual void OnUnregistration(int fd, bool replaced) OVERRIDE {}
   virtual void OnShutdown(EpollServer* eps, int fd) OVERRIDE {}
 
+  // ReliableQuicStream::Visitor
+  virtual void OnClose(ReliableQuicStream* stream) OVERRIDE;
+
   QuicPacketCreator::Options* options();
 
   QuicClientSession* session() { return session_.get(); }
@@ -190,6 +196,10 @@ class QuicClient : public EpollCallbackInterface {
   // Which QUIC version does this client talk?
   QuicVersion version_;
 
+  // If true, then the contents of each response will be printed to stdout
+  // when the stream is closed (in OnClose).
+  bool print_response_;
+
   DISALLOW_COPY_AND_ASSIGN(QuicClient);
 };