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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_CHROME_BROWSER_FIELD_TRIALS_H_
      6 #define CHROME_BROWSER_CHROME_BROWSER_FIELD_TRIALS_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/command_line.h"
     10 
     11 class PrefService;
     12 
     13 namespace base {
     14 class Time;
     15 }
     16 
     17 class ChromeBrowserFieldTrials {
     18  public:
     19   explicit ChromeBrowserFieldTrials(const base::CommandLine& command_line);
     20   ~ChromeBrowserFieldTrials();
     21 
     22   // Called by the browser main sequence to set up Field Trials for this client.
     23   // |local_state| is used to set browser-wide properties.
     24   void SetupFieldTrials(const base::Time& install_time,
     25                         PrefService* local_state);
     26 
     27  private:
     28   // Instantiates dynamic trials by querying their state, to ensure they get
     29   // reported as used.
     30   void InstantiateDynamicTrials();
     31 
     32   const base::CommandLine& parsed_command_line_;
     33 
     34   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserFieldTrials);
     35 };
     36 
     37 #endif  // CHROME_BROWSER_CHROME_BROWSER_FIELD_TRIALS_H_
     38