Add brotli content-encoding filter.

chrome/browser/io_thread.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_IO_THREAD_H_
 #define CHROME_BROWSER_IO_THREAD_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 193 matching lines @@
     Optional<bool> enable_spdy_ping_based_connection_checking;
     Optional<net::NextProto> spdy_default_protocol;
     net::NextProtoVector next_protos;
     Optional<std::string> trusted_spdy_proxy;
     std::set<net::HostPortPair> forced_spdy_exclusions;
     Optional<bool> use_alternative_services;
     Optional<double> alternative_service_probability_threshold;
 
     Optional<bool> enable_npn;
 
+    Optional<bool> enable_brotli;
+
     Optional<bool> enable_quic;
     Optional<bool> enable_quic_for_proxies;
     Optional<bool> enable_quic_port_selection;
     Optional<bool> quic_always_require_handshake_confirmation;
     Optional<bool> quic_disable_connection_pooling;
     Optional<float> quic_load_server_info_timeout_srtt_multiplier;
     Optional<bool> quic_enable_connection_racing;
     Optional<bool> quic_enable_non_blocking_io;
     Optional<bool> quic_disable_disk_cache;
     Optional<bool> quic_prefer_aes;
@@ skipping 120 matching lines @@
   // well as the QUIC field trial group.
   void ConfigureQuic(const base::CommandLine& command_line);
 
   extensions::EventRouterForwarder* extension_event_router_forwarder() {
 #if defined(ENABLE_EXTENSIONS)
     return extension_event_router_forwarder_;
 #else
     return NULL;
 #endif
   }
+
+  // Returns true if Brotli Content-Encoding should be enabled.
+  static bool ShouldEnableBrotli(const base::CommandLine& command_line);
+
   // Configures QUIC options in |globals| based on the flags in |command_line|
   // as well as the QUIC field trial group and parameters.  Must be called
   // before ConfigureSpdyGlobals.
   static void ConfigureQuicGlobals(
       const base::CommandLine& command_line,
       base::StringPiece quic_trial_group,
       const VariationParameters& quic_trial_params,
       bool quic_allowed_by_policy,
       Globals* globals);
 
@@ skipping 195 matching lines @@
   bool is_quic_allowed_by_policy_;
 
   const base::TimeTicks creation_time_;
 
   base::WeakPtrFactory<IOThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IOThread);
 };
 
 #endif  // CHROME_BROWSER_IO_THREAD_H_