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 0d14e0f9a0eac6683aa6ff8a411cffe4fb796ca1..512b09d327fff2d57b57bf400ffa5847bbd8e899 100644
--- a/net/http/http_basic_stream.cc
+++ b/net/http/http_basic_stream.cc
@@ -87,6 +87,12 @@ int64 HttpBasicStream::GetTotalReceivedBytes() const {
   return 0;
 }
 
+int64_t HttpBasicStream::GetTotalSentBytes() const {
+  if (parser())

[bengr, 2015/09/01 23:48:26]

For both Sent and Received, is there the potential to miss some bytes if
!parser()? If so, what are the specific cases?

[sclittle, 2015/09/01 23:57:22]

When RenewStreamForAuth is called, then parser() will be deleted, and
GetTotalReceived/SentBytes will drop to 0. The HttpNetworkTransaction already
accounts for this properly, and there's a DCHECK in
URLRequestJob::NotifyNetworkBytesReceived checking that the
GetTotalReceivedBytes visible to higher layers doesn't decrease.

+    return parser()->sent_bytes();
+  return 0;
+}
+
 bool HttpBasicStream::GetLoadTimingInfo(
     LoadTimingInfo* load_timing_info) const {
   return state_.connection()->GetLoadTimingInfo(IsConnectionReused(),