Added and implemented HttpStream::GetTotalSentBytes for basic streams.

net/http/http_response_body_drainer_unittest.cc

Index: net/http/http_response_body_drainer_unittest.cc
diff --git a/net/http/http_response_body_drainer_unittest.cc b/net/http/http_response_body_drainer_unittest.cc
index f34f57fc5366dbef162c96c18703043c07108875..b2defb0a5e2395ec713ab6d7fcdea08e77208a29 100644
--- a/net/http/http_response_body_drainer_unittest.cc
+++ b/net/http/http_response_body_drainer_unittest.cc
@@ -4,6 +4,8 @@
 
 #include "net/http/http_response_body_drainer.h"
 
+#include <stdint.h>
+
 #include <cstring>
 
 #include "base/bind.h"
@@ -100,6 +102,7 @@ class MockHttpStream : public HttpStream {
   void SetConnectionReused() override {}
   bool CanReuseConnection() const override { return false; }
   int64 GetTotalReceivedBytes() const override { return 0; }
+  int64_t GetTotalSentBytes() const override { return 0; }
   void GetSSLInfo(SSLInfo* ssl_info) override {}
   void GetSSLCertRequestInfo(SSLCertRequestInfo* cert_request_info) override {}