Store and retrieve features from shared memory

content/browser/browser_child_process_host_impl.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 "content/browser/browser_child_process_host_impl.h"
 
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/dump_without_crashing.h"
@@ skipping 201 matching lines @@
   BrowserChildProcessList copy = g_child_process_list.Get();
   for (BrowserChildProcessList::iterator it = copy.begin();
        it != copy.end(); ++it) {
     delete (*it)->delegate();  // ~*HostDelegate deletes *HostImpl.
   }
 }
 
 // static
 void BrowserChildProcessHostImpl::CopyFeatureAndFieldTrialFlags(
     base::CommandLine* cmd_line) {
-  std::string enabled_features;
-  std::string disabled_features;
-  base::FeatureList::GetInstance()->GetFeatureOverrides(&enabled_features,
-                                                        &disabled_features);
-  if (!enabled_features.empty())
-    cmd_line->AppendSwitchASCII(switches::kEnableFeatures, enabled_features);
-  if (!disabled_features.empty())
-    cmd_line->AppendSwitchASCII(switches::kDisableFeatures, disabled_features);
-
   // If we run base::FieldTrials, we want to pass to their state to the
   // child process so that it can act in accordance with each state.
-  base::FieldTrialList::CopyFieldTrialStateToFlags(switches::kFieldTrialHandle,
-                                                   cmd_line);
+  base::FieldTrialList::CopyFieldTrialStateToFlags(
+      switches::kFieldTrialHandle, switches::kEnableFeatures,
+      switches::kDisableFeatures, cmd_line);
 }
 
 void BrowserChildProcessHostImpl::Launch(
     SandboxedProcessLauncherDelegate* delegate,
     base::CommandLine* cmd_line,
     bool terminate_on_shutdown) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   GetContentClient()->browser()->AppendExtraCommandLineSwitches(
       cmd_line, data_.id);
@@ skipping 361 matching lines @@
 
 #if defined(OS_WIN)
 
 void BrowserChildProcessHostImpl::OnObjectSignaled(HANDLE object) {
   OnChildDisconnected();
 }
 
 #endif
 
 }  // namespace content