Log source_dependency in HTTP2_SESSION_SEND_HEADERS.

net/spdy/bidirectional_stream_spdy_impl.cc

Index: net/spdy/bidirectional_stream_spdy_impl.cc
diff --git a/net/spdy/bidirectional_stream_spdy_impl.cc b/net/spdy/bidirectional_stream_spdy_impl.cc
index 07f240db5e45a781aa88fd36a1a8bfc9190be688..e926201edaa8a78847e6591de08cf59ae69bb5c0 100644
--- a/net/spdy/bidirectional_stream_spdy_impl.cc
+++ b/net/spdy/bidirectional_stream_spdy_impl.cc
@@ -30,10 +30,12 @@ const int kBufferTimeMs = 1;
 }  // namespace
 
 BidirectionalStreamSpdyImpl::BidirectionalStreamSpdyImpl(
-    const base::WeakPtr<SpdySession>& spdy_session)
+    const base::WeakPtr<SpdySession>& spdy_session,
+    NetLogSource source_dependency)
     : spdy_session_(spdy_session),
       request_info_(nullptr),
       delegate_(nullptr),
+      source_dependency_(source_dependency),
       negotiated_protocol_(kProtoUnknown),
       more_read_data_pending_(false),
       read_buffer_len_(0),
@@ -293,6 +295,10 @@ void BidirectionalStreamSpdyImpl::OnClose(int status) {
     OnDataSent();
 }
 
+NetLogSource BidirectionalStreamSpdyImpl::source_dependency() const {
+  return source_dependency_;
+}
+
 int BidirectionalStreamSpdyImpl::SendRequestHeadersHelper() {
   SpdyHeaderBlock headers;
   HttpRequestInfo http_request_info;