| // 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 "chrome/browser/chrome_browser_field_trials.h" |
| |
| #include <string> |
| |
| #include "base/command_line.h" |
| #include "base/feature_list.h" |
| #include "base/metrics/field_trial.h" |
| #include "base/metrics/histogram_base.h" |
| #include "base/metrics/persistent_histogram_allocator.h" |
| #include "base/strings/string_util.h" |
| #include "base/time/time.h" |
| #include "build/build_config.h" |
| #include "chrome/common/chrome_switches.h" |
| #include "components/metrics/metrics_pref_names.h" |
| |
| #if defined(OS_ANDROID) |
| #include "chrome/browser/chrome_browser_field_trials_mobile.h" |
| #else |
| #include "chrome/browser/chrome_browser_field_trials_desktop.h" |
| #endif |
| |
| namespace { |
| |
| // Check for feature enabling the use of persistent histogram storage and |
| // enable the global allocator if so. |
| void InstantiatePersistentHistograms() { |
| if (base::FeatureList::IsEnabled(base::kPersistentHistogramsFeature)) { |
| base::GlobalHistogramAllocator::Enable(); |
| base::GlobalHistogramAllocator* allocator = |
| base::GlobalHistogramAllocator::Get(); |
| DCHECK(allocator); // Should have been created during startup. |
| allocator->CreateTrackingHistograms(allocator->Name()); |
| } |
| } |
| |
| } // namespace |
| |
| ChromeBrowserFieldTrials::ChromeBrowserFieldTrials( |
| const base::CommandLine& parsed_command_line) |
| : parsed_command_line_(parsed_command_line) { |
| } |
| |
| ChromeBrowserFieldTrials::~ChromeBrowserFieldTrials() { |
| } |
| |
| void ChromeBrowserFieldTrials::SetupFieldTrials() { |
| // Field trials that are shared by all platforms. |
| InstantiateDynamicTrials(); |
| |
| #if defined(OS_ANDROID) |
| chrome::SetupMobileFieldTrials(parsed_command_line_); |
| #else |
| chrome::SetupDesktopFieldTrials(parsed_command_line_); |
| #endif |
| } |
| |
| void ChromeBrowserFieldTrials::InstantiateDynamicTrials() { |
| // Persistent histograms must be enabled as soon as possible. |
| InstantiatePersistentHistograms(); |
| } |