Add memory ablation experiment.

chrome/browser/chrome_browser_main.cc

 // 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_main.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <set>
@@ skipping 42 matching lines @@
 #include "chrome/browser/component_updater/file_type_policies_component_installer.h"
 #include "chrome/browser/component_updater/origin_trials_component_installer.h"
 #include "chrome/browser/component_updater/pepper_flash_component_installer.h"
 #include "chrome/browser/component_updater/recovery_component_installer.h"
 #include "chrome/browser/component_updater/recovery_improved_component_installer.h"
 #include "chrome/browser/component_updater/sth_set_component_installer.h"
 #include "chrome/browser/component_updater/subresource_filter_component_installer.h"
 #include "chrome/browser/component_updater/supervised_user_whitelist_installer.h"
 #include "chrome/browser/component_updater/widevine_cdm_component_installer.h"
 #include "chrome/browser/defaults.h"
+#include "chrome/browser/experiments/memory_ablation_experiment.h"
 #include "chrome/browser/first_run/first_run.h"
 #include "chrome/browser/geolocation/chrome_access_token_store.h"
 #include "chrome/browser/gpu/gpu_profile_cache.h"
 #include "chrome/browser/gpu/three_d_api_observer.h"
 #include "chrome/browser/media/webrtc/media_capture_devices_dispatcher.h"
 #include "chrome/browser/memory/tab_manager.h"
 #include "chrome/browser/metrics/chrome_metrics_service_accessor.h"
 #include "chrome/browser/metrics/field_trial_synchronizer.h"
 #include "chrome/browser/metrics/renderer_uptime_tracker.h"
 #include "chrome/browser/metrics/thread_watcher.h"
@@ skipping 1349 matching lines @@
 int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
   TRACE_EVENT0("startup", "ChromeBrowserMainParts::PreMainMessageLoopRunImpl");
 
   SCOPED_UMA_HISTOGRAM_LONG_TIMER("Startup.PreMainMessageLoopRunImplLongTime");
   const base::TimeTicks start_time_step1 = base::TimeTicks::Now();
 
   // This must occur at PreMainMessageLoopRun because |SetupMetrics()| uses the
   // blocking pool, which is disabled until the CreateThreads phase of startup.
   SetupMetrics();
 
+  // Can't be in SetupFieldTrials() because it needs a task runner.
+  MemoryAblationExperiment::MaybeStart(
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::IO));
+
 #if defined(OS_WIN)
   // Windows parental controls calls can be slow, so we do an early init here
   // that calculates this value off of the UI thread.
   IncognitoModePrefs::InitializePlatformParentalControls();
 #endif
 
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   if (!variations::GetVariationParamValue(
       "LightSpeed", "EarlyInitStartup").empty()) {
     // Try to compute this early on another thread so that we don't spend time
@@ skipping 632 matching lines @@
   chromeos::CrosSettings::Shutdown();
 #endif  // defined(OS_CHROMEOS)
 #endif  // defined(OS_ANDROID)
 }
 
 // Public members:
 
 void ChromeBrowserMainParts::AddParts(ChromeBrowserMainExtraParts* parts) {
   chrome_extra_parts_.push_back(parts);
 }