Added and implemented HttpStream::GetTotalSentBytes for basic streams.

net/http/http_basic_stream.cc

Index: net/http/http_basic_stream.cc
diff --git a/net/http/http_basic_stream.cc b/net/http/http_basic_stream.cc
index 795e299bb6cd62ebd043acfdd2251cc515990a6b..42a25929fe53e05a173178970a23d33316b79cf7 100644
--- a/net/http/http_basic_stream.cc
+++ b/net/http/http_basic_stream.cc
@@ -83,6 +83,12 @@ int64 HttpBasicStream::GetTotalReceivedBytes() const {
   return 0;
 }
 
+int64_t HttpBasicStream::GetTotalSentBytes() const {
+  if (parser())
+    return parser()->sent_bytes();
+  return 0;
+}
+
 bool HttpBasicStream::GetLoadTimingInfo(
     LoadTimingInfo* load_timing_info) const {
   return state_.connection()->GetLoadTimingInfo(IsConnectionReused(),