Log source_dependency in HTTP2_SESSION_SEND_HEADERS.

net/spdy/spdy_http_stream.cc

Index: net/spdy/spdy_http_stream.cc
diff --git a/net/spdy/spdy_http_stream.cc b/net/spdy/spdy_http_stream.cc
index 700f17fef8f6b519927672c639306d4e485c385a..3a70ae6b2c968410393906706cbce1f75c2f7a99 100644
--- a/net/spdy/spdy_http_stream.cc
+++ b/net/spdy/spdy_http_stream.cc
@@ -34,10 +34,12 @@ namespace net {
 const size_t SpdyHttpStream::kRequestBodyBufferSize = 1 << 14;  // 16KB
 
 SpdyHttpStream::SpdyHttpStream(const base::WeakPtr<SpdySession>& spdy_session,
-                               bool direct)
+                               bool direct,
+                               NetLogSource source_dependency)
     : MultiplexedHttpStream(MultiplexedSessionHandle(spdy_session)),
       spdy_session_(spdy_session),
       is_reused_(spdy_session_->IsReused()),
+      source_dependency_(source_dependency),
       stream_(nullptr),
       stream_closed_(false),
       closed_stream_status_(ERR_FAILED),
@@ -395,6 +397,10 @@ void SpdyHttpStream::OnClose(int status) {
   }
 }
 
+NetLogSource SpdyHttpStream::source_dependency() const {
+  return source_dependency_;
+}
+
 bool SpdyHttpStream::HasUploadData() const {
   CHECK(request_info_);
   return