chrome_browser_field_trials.h revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd 
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#include "base/gtest_prod_util.h"
11#include "base/time.h"
12
13class ChromeBrowserFieldTrials {
14 public:
15  explicit ChromeBrowserFieldTrials(const CommandLine& command_line);
16  ~ChromeBrowserFieldTrials();
17
18  // Called by the browser main sequence to set up Field Trials for this client.
19  // |install_time| is the time this browser was installed (or the last time
20  // prefs was reset). |install_time| is used by trials that are only created
21  // for new installs of the browser.
22  void SetupFieldTrials(const base::Time& install_time);
23
24 private:
25  FRIEND_TEST_ALL_PREFIXES(BrowserMainTest,
26                           WarmConnectionFieldTrial_WarmestSocket);
27  FRIEND_TEST_ALL_PREFIXES(BrowserMainTest, WarmConnectionFieldTrial_Random);
28  FRIEND_TEST_ALL_PREFIXES(BrowserMainTest, WarmConnectionFieldTrial_Invalid);
29
30  // Sets up common desktop-only field trials.
31  // Add an invocation of your field trial init function to this method, or to
32  // SetupFieldTrials if it is for all platforms.
33  void SetupDesktopFieldTrials();
34
35  // A/B test for spdy when --use-spdy not set.
36  void SpdyFieldTrial();
37
38  // A/B test for warmest socket vs. most recently used socket.
39  void WarmConnectionFieldTrial();
40
41  // Field trial to see what disabling DNS pre-resolution does to
42  // latency of page loads.
43  void PredictorFieldTrial();
44
45  // A field trial to see what effects launching Chrome automatically on
46  // computer startup has on retention and usage of Chrome.
47  void AutoLaunchChromeFieldTrial();
48
49  // A collection of one-time-randomized and session-randomized field trials
50  // intended to test the uniformity and correctness of the field trial control,
51  // bucketing and reporting systems.
52  void SetupUniformityFieldTrials(const base::Time& install_date);
53
54  // Sets up the InfiniteCache field trial.
55  void SetUpInfiniteCacheFieldTrial();
56
57  // Sets up field trials for doing Cache Sensitivity Analysis.
58  void SetUpCacheSensitivityAnalysisFieldTrial();
59
60  // Disables the show profile switcher field trial if multi-profiles is not
61  // enabled.
62  void DisableShowProfileSwitcherTrialIfNecessary();
63
64  // A field trial to determine the impact of using non-blocking reads for
65  // TCP sockets on Windows instead of overlapped I/O.
66  void WindowsOverlappedTCPReadsFieldTrial();
67
68  // A field trial to check the simple cache performance.
69  void SetUpSimpleCacheFieldTrial();
70
71  // Instantiates dynamic trials by querying their state, to ensure they get
72  // reported as used.
73  void InstantiateDynamicTrials();
74
75  const CommandLine& parsed_command_line_;
76
77  DISALLOW_COPY_AND_ASSIGN(ChromeBrowserFieldTrials);
78};
79
80#endif  // CHROME_BROWSER_CHROME_BROWSER_FIELD_TRIALS_H_
81