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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "chrome/browser/chrome_browser_field_trials.h" | 5 #include "chrome/browser/chrome_browser_field_trials.h" |
6 | 6 |
7 #include <string> | 7 #include <string> |
8 | 8 |
9 #include "base/command_line.h" | 9 #include "base/command_line.h" |
| 10 #include "base/feature_list.h" |
10 #include "base/metrics/field_trial.h" | 11 #include "base/metrics/field_trial.h" |
| 12 #include "base/metrics/histogram_base.h" |
| 13 #include "base/metrics/histogram_persistence.h" |
11 #include "base/strings/string_util.h" | 14 #include "base/strings/string_util.h" |
12 #include "base/time/time.h" | 15 #include "base/time/time.h" |
13 #include "build/build_config.h" | 16 #include "build/build_config.h" |
14 #include "chrome/common/chrome_switches.h" | 17 #include "chrome/common/chrome_switches.h" |
15 #include "components/metrics/metrics_pref_names.h" | 18 #include "components/metrics/metrics_pref_names.h" |
16 | 19 |
17 #if defined(OS_ANDROID) || defined(OS_IOS) | 20 #if defined(OS_ANDROID) || defined(OS_IOS) |
18 #include "chrome/browser/chrome_browser_field_trials_mobile.h" | 21 #include "chrome/browser/chrome_browser_field_trials_mobile.h" |
19 #else | 22 #else |
20 #include "chrome/browser/chrome_browser_field_trials_desktop.h" | 23 #include "chrome/browser/chrome_browser_field_trials_desktop.h" |
21 #endif | 24 #endif |
22 | 25 |
| 26 namespace { |
| 27 |
| 28 // Check for feature enabling the use of persistent histogram storage and |
| 29 // create an appropriate allocator for such if so. |
| 30 void InstantiatePersistentHistograms() { |
| 31 if (base::FeatureList::IsEnabled(base::kPersistentHistogramsFeature)) { |
| 32 const std::string allocator_name("BrowserMetricsAllocator"); |
| 33 // Create persistent/shared memory and allow histograms to be stored in it. |
| 34 // TODO(bcwhite): Update this with correct allocator and memory size. |
| 35 base::SetPersistentHistogramMemoryAllocator( |
| 36 new base::LocalPersistentMemoryAllocator(1 << 20, // 1 MiB |
| 37 0x4D5B9953, // SHA1(B..M..A..) |
| 38 allocator_name)); |
| 39 base::GetPersistentHistogramMemoryAllocator()->CreateTrackingHistograms( |
| 40 allocator_name); |
| 41 } |
| 42 } |
| 43 |
| 44 } // namespace |
| 45 |
23 ChromeBrowserFieldTrials::ChromeBrowserFieldTrials( | 46 ChromeBrowserFieldTrials::ChromeBrowserFieldTrials( |
24 const base::CommandLine& parsed_command_line) | 47 const base::CommandLine& parsed_command_line) |
25 : parsed_command_line_(parsed_command_line) { | 48 : parsed_command_line_(parsed_command_line) { |
26 } | 49 } |
27 | 50 |
28 ChromeBrowserFieldTrials::~ChromeBrowserFieldTrials() { | 51 ChromeBrowserFieldTrials::~ChromeBrowserFieldTrials() { |
29 } | 52 } |
30 | 53 |
31 void ChromeBrowserFieldTrials::SetupFieldTrials() { | 54 void ChromeBrowserFieldTrials::SetupFieldTrials() { |
32 // Field trials that are shared by all platforms. | 55 // Field trials that are shared by all platforms. |
33 InstantiateDynamicTrials(); | 56 InstantiateDynamicTrials(); |
34 | 57 |
35 #if defined(OS_ANDROID) || defined(OS_IOS) | 58 #if defined(OS_ANDROID) || defined(OS_IOS) |
36 chrome::SetupMobileFieldTrials(parsed_command_line_); | 59 chrome::SetupMobileFieldTrials(parsed_command_line_); |
37 #else | 60 #else |
38 chrome::SetupDesktopFieldTrials(parsed_command_line_); | 61 chrome::SetupDesktopFieldTrials(parsed_command_line_); |
39 #endif | 62 #endif |
40 } | 63 } |
41 | 64 |
42 void ChromeBrowserFieldTrials::InstantiateDynamicTrials() { | 65 void ChromeBrowserFieldTrials::InstantiateDynamicTrials() { |
| 66 // Persistent histograms must be enabled as soon as possible. |
| 67 InstantiatePersistentHistograms(); |
43 // The following trials are used from renderer process. | 68 // The following trials are used from renderer process. |
44 // Mark here so they will be sync-ed. | 69 // Mark here so they will be sync-ed. |
45 base::FieldTrialList::FindValue("DisplayList2dCanvas"); | 70 base::FieldTrialList::FindValue("DisplayList2dCanvas"); |
46 } | 71 } |
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