Add brotli content-encoding filter.

chrome/browser/io_thread.cc

Index: chrome/browser/io_thread.cc
diff --git a/chrome/browser/io_thread.cc b/chrome/browser/io_thread.cc
index 8808ac40805ec39a837112dd9d5b980e179171c1..78d7c1739a4fb77298c51597a02062ffe0a8d3eb 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -78,6 +78,7 @@
 #include "net/http/http_auth_filter.h"
 #include "net/http/http_auth_handler_factory.h"
 #include "net/http/http_auth_preferences.h"
+#include "net/http/http_features.h"
 #include "net/http/http_network_layer.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_server_properties_impl.h"
@@ -842,6 +843,7 @@ void IOThread::Init() {
           switches::kEnableUserAlternateProtocolPorts)) {
     globals_->enable_user_alternate_protocol_ports = true;
   }
+  globals_->enable_brotli.set(net::features::IsBrotliEncodingEnabled());
   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
   // is fixed.
   tracked_objects::ScopedTracker tracking_profile13(
@@ -1137,6 +1139,8 @@ void IOThread::InitializeNetworkSessionParamsFromGlobals(
 
   globals.enable_npn.CopyToIfSet(&params->enable_npn);
 
+  globals.enable_brotli.CopyToIfSet(&params->enable_brotli);
+
   globals.enable_quic.CopyToIfSet(&params->enable_quic);
   globals.enable_quic_for_proxies.CopyToIfSet(&params->enable_quic_for_proxies);
   globals.quic_always_require_handshake_confirmation.CopyToIfSet(