Add brotli content-encoding filter.

chrome/browser/io_thread.cc

 // 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.
 
 #include "chrome/browser/io_thread.h"
 
 #include <vector>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 807 matching lines @@
   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
   // is fixed.
   tracked_objects::ScopedTracker tracking_profile12_5(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
           "466432 IOThread::InitAsync::QuicConfiguration"));
   ConfigureQuic(command_line);
   if (command_line.HasSwitch(
           switches::kEnableUserAlternateProtocolPorts)) {
     globals_->enable_user_alternate_protocol_ports = true;
   }
+  globals_->enable_brotli.set(ShouldEnableBrotli(command_line));
   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
   // is fixed.
   tracked_objects::ScopedTracker tracking_profile13(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
           "466432 IOThread::InitAsync::InitializeNetworkOptions"));
   InitializeNetworkOptions(command_line);
 
   TRACE_EVENT_BEGIN0("startup",
                      "IOThread::Init:ProxyScriptFetcherRequestContext");
   globals_->proxy_script_fetcher_context.reset(
@@ skipping 252 matching lines @@
   params->next_protos = globals.next_protos;
   globals.trusted_spdy_proxy.CopyToIfSet(&params->trusted_spdy_proxy);
   params->forced_spdy_exclusions = globals.forced_spdy_exclusions;
   globals.use_alternative_services.CopyToIfSet(
       &params->use_alternative_services);
   globals.alternative_service_probability_threshold.CopyToIfSet(
       &params->alternative_service_probability_threshold);
 
   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(
       &params->quic_always_require_handshake_confirmation);
   globals.quic_disable_connection_pooling.CopyToIfSet(
       &params->quic_disable_connection_pooling);
   globals.quic_load_server_info_timeout_srtt_multiplier.CopyToIfSet(
       &params->quic_load_server_info_timeout_srtt_multiplier);
   globals.quic_enable_connection_racing.CopyToIfSet(
       &params->quic_enable_connection_racing);
@@ skipping 192 matching lines @@
   if (command_line.HasSwitch(switches::kOriginToForceQuicOn)) {
     net::HostPortPair quic_origin =
         net::HostPortPair::FromString(
             command_line.GetSwitchValueASCII(switches::kOriginToForceQuicOn));
     if (!quic_origin.IsEmpty()) {
       globals->origin_to_force_quic_on.set(quic_origin);
     }
   }
 }
 
+bool IOThread::ShouldEnableBrotli(const base::CommandLine& command_line) {
+  if (command_line.HasSwitch(switches::kDisableBrotli))
+    return false;
+  return command_line.HasSwitch(switches::kEnableBrotli);

[Randy Smith (Not in Mondays), 2015/12/04 16:07:52]

If I read this correctly, Brotli will be compiled in on non-iOS platforms,
disabled by default, and enabled only via flags or command lines.  Is your plan
to test with it manually for a bit before doing a finch experiment/default
enable?

[eustas, 2015/12/07 12:30:37]

I think we can actually have brotli enabled by default soon (there are not many
servers that can serve brotli encoded data).

I've chosen disabled-by-default to make this patch more clear (otherwise it
would require adding "br" to Accept-Encoding headers in integration tests).

+}
+
 bool IOThread::ShouldEnableQuic(const base::CommandLine& command_line,
                                 base::StringPiece quic_trial_group,
                                 bool quic_allowed_by_policy) {
   if (command_line.HasSwitch(switches::kDisableQuic) || !quic_allowed_by_policy)
     return false;
 
   if (command_line.HasSwitch(switches::kEnableQuic))
     return true;
 
   return quic_trial_group.starts_with(kQuicFieldTrialEnabledGroupName) ||
@@ skipping 368 matching lines @@
   globals->proxy_script_fetcher_url_request_job_factory = job_factory.Pass();
 
   context->set_job_factory(
       globals->proxy_script_fetcher_url_request_job_factory.get());
 
   // TODO(rtenneti): We should probably use HttpServerPropertiesManager for the
   // system URLRequestContext too. There's no reason this should be tied to a
   // profile.
   return context;
 }