Field trial synchronization to PPAPI process.

components/variations/child_process_field_trial_syncer.h

 // Copyright 2016 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_COMMON_VARIATIONS_CHILD_PROCESS_FIELD_TRIAL_SYNCER_H_
-#define CHROME_COMMON_VARIATIONS_CHILD_PROCESS_FIELD_TRIAL_SYNCER_H_
+#ifndef COMPONENTS_VARIATIONS_FIELD_TRIAL_SYNCER_H_
+#define COMPONENTS_VARIATIONS_FIELD_TRIAL_SYNCER_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/metrics/field_trial.h"
 
 namespace base {
 class CommandLine;
 }
 
-namespace chrome_variations {
+namespace variations {
 
 // ChildProcessFieldTrialSyncer is a utility class that's responsible for
 // syncing the "activated" state of field trials between browser and child
 // processes. Specifically, when a field trial is activated in the browser, it
 // also activates it in the child process and when a field trial is activated
 // in the child process, it notifies the browser process to activate it.
 class ChildProcessFieldTrialSyncer {
  public:
   // ChildProcessFieldTrialSyncer constructor taking an externally owned
   // |observer| param that's responsible for sending IPCs to the browser process
   // when a trial is activated. The |observer| must outlive this object.
   explicit ChildProcessFieldTrialSyncer(
       base::FieldTrialList::Observer* observer);
   ~ChildProcessFieldTrialSyncer();
 
   // Initializes field trial state change observation and notifies the browser
-  // of any field trials that might have already been activated.
-  void InitFieldTrialObserving(const base::CommandLine& command_line);
+  // of any field trials that might have already been activated. Takes the
+  // switch name for single process mode as a parameter, since that's not
+  // visible to the component.
+  void InitFieldTrialObserving(const base::CommandLine& command_line,
+                               const char* single_process_switch_name);
 
   // Handler for messages from the browser process notifying the child process
   // that a field trial was activated.
   void OnSetFieldTrialGroup(const std::string& trial_name,
                             const std::string& group_name);
 
  private:
   base::FieldTrialList::Observer* const observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildProcessFieldTrialSyncer);
 };
 
-}  // namespace chrome_variations
+}  // namespace variations
 
-#endif  // CHROME_COMMON_VARIATIONS_CHILD_PROCESS_FIELD_TRIAL_SYNCER_H_
+#endif  // COMPONENTS_VARIATIONS_FIELD_TRIAL_SYNCER_H_