Add FeatureList instance to renderers and propgate enable/disable flags.

content/renderer/renderer_main.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 "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/debug/debugger.h"
 #include "base/debug/leak_annotations.h"
+#include "base/feature_list.h"
 #include "base/i18n/rtl.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/pending_task.h"
 #include "base/strings/string_util.h"
 #include "base/sys_info.h"
 #include "base/threading/platform_thread.h"
 #include "base/timer/hi_res_timer_manager.h"
@@ skipping 133 matching lines @@
   base::FieldTrialList field_trial_list(NULL);
   // Ensure any field trials in browser are reflected into renderer.
   if (parsed_command_line.HasSwitch(switches::kForceFieldTrials)) {
     bool result = base::FieldTrialList::CreateTrialsFromString(
         parsed_command_line.GetSwitchValueASCII(switches::kForceFieldTrials),
         base::FieldTrialList::DONT_ACTIVATE_TRIALS,
         std::set<std::string>());
     DCHECK(result);
   }
 
+  scoped_ptr<base::FeatureList> feature_list(new base::FeatureList);
+  feature_list->InitializeFromCommandLine(
+      parsed_command_line.GetSwitchValueASCII(switches::kEnableFeatures),
+      parsed_command_line.GetSwitchValueASCII(switches::kDisableFeatures));
+  base::FeatureList::SetInstance(feature_list.Pass());
+
   // PlatformInitialize uses FieldTrials, so this must happen later.
   platform.PlatformInitialize();
 
 #if defined(ENABLE_PLUGINS)
   // Load pepper plugins before engaging the sandbox.
   PepperPluginRegistry::GetInstance();
 #endif
 #if defined(ENABLE_WEBRTC)
   // Initialize WebRTC before engaging the sandbox.
   // NOTE: On linux, this call could already have been made from
@@ skipping 34 matching lines @@
     // ignore shutdown-only leaks.
     __lsan_do_leak_check();
 #endif
   }
   platform.PlatformUninitialize();
   TRACE_EVENT_END_ETW("RendererMain", 0, "");
   return 0;
 }
 
 }  // namespace content