Emit session-level WINDOW_UPDATEs less frequently.

net/http/http_network_session.cc

Index: net/http/http_network_session.cc
diff --git a/net/http/http_network_session.cc b/net/http/http_network_session.cc
index 72ed8813c18c05ca8e39d261c93f456f62e7b72b..93ea441a1c9bbff5b4de5823815b2c737ee258ed 100644
--- a/net/http/http_network_session.cc
+++ b/net/http/http_network_session.cc
@@ -74,6 +74,7 @@ HttpNetworkSession::Params::Params()
       enable_spdy_compression(true),
       enable_spdy_ping_based_connection_checking(true),
       spdy_default_protocol(kProtoUnknown),
+      spdy_session_max_recv_window_size(0),
       spdy_stream_initial_recv_window_size(0),

[Ryan Hamilton, 2015/04/07 14:56:40]

instead of setting these to 0 by default, an alternative would be to set them to
the value we actually want them to have by default. Namely, 10MB. Then you could
remove the "foo == 0 ? foo : kSomething" checks from SpdySession.  

[Bence, 2015/04/07 20:21:37]

Done.  Nice.

I moved the constant to this file, since it's only used here.

       spdy_initial_max_concurrent_streams(0),
       spdy_max_concurrent_streams_limit(0),
@@ -152,6 +153,7 @@ HttpNetworkSession::HttpNetworkSession(const Params& params)
                          params.enable_spdy_compression,
                          params.enable_spdy_ping_based_connection_checking,
                          params.spdy_default_protocol,
+                         params.spdy_session_max_recv_window_size,
                          params.spdy_stream_initial_recv_window_size,
                          params.spdy_initial_max_concurrent_streams,
                          params.spdy_max_concurrent_streams_limit,