Add memory ablation experiment.

chrome/browser/about_flags.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/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/feature_list.h"
 #include "base/i18n/base_i18n_switches.h"
 #include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/metrics_hashes.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task_scheduler/switches.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "cc/base/switches.h"
+#include "chrome/browser/experiments/memory_ablation_experiment.h"
 #include "chrome/browser/flag_descriptions.h"
 #include "chrome/browser/ntp_snippets/ntp_snippets_features.h"
 #include "chrome/browser/predictors/resource_prefetch_common.h"
 #include "chrome/browser/prerender/prerender_field_trial.h"
 #include "chrome/common/channel_info.h"
 #include "chrome/common/chrome_content_client.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/features.h"
 #include "chrome/common/pause_tabs_field_trial.h"
@@ skipping 793 matching lines @@
     {"(force test doodle 5)", kUseNewDoodleApiTest5,
      arraysize(kUseNewDoodleApiTest5), nullptr},
     {"(force test doodle 6)", kUseNewDoodleApiTest6,
      arraysize(kUseNewDoodleApiTest6), nullptr},
     {"(force test doodle 7)", kUseNewDoodleApiTest7,
      arraysize(kUseNewDoodleApiTest7), nullptr},
     {"(force test doodle 8)", kUseNewDoodleApiTest8,
      arraysize(kUseNewDoodleApiTest8), nullptr}};
 #endif  // OS_ANDROID
 
+const FeatureEntry::FeatureParam kMemoryAblation1MiB[] = {
+    {kMemoryAblationFeatureSizeParam, "1048576"}};
+const FeatureEntry::FeatureParam kMemoryAblation5MiB[] = {
+    {kMemoryAblationFeatureSizeParam, "5242880"}};
+const FeatureEntry::FeatureParam kMemoryAblation10MiB[] = {
+    {kMemoryAblationFeatureSizeParam, "10485760"}};
+const FeatureEntry::FeatureParam kMemoryAblation50MiB[] = {
+    {kMemoryAblationFeatureSizeParam, "52428800"}};
+
+const FeatureEntry::FeatureVariation kMemoryAblationFeatureVariations[] = {
+    {"1 MiB", kMemoryAblation1MiB, arraysize(kMemoryAblation1MiB), nullptr},
+    {"5 MiB", kMemoryAblation5MiB, arraysize(kMemoryAblation5MiB), nullptr},
+    {"10 MiB", kMemoryAblation10MiB, arraysize(kMemoryAblation10MiB), nullptr},
+    {"50 MiB", kMemoryAblation50MiB, arraysize(kMemoryAblation50MiB), nullptr}};
+
 #if defined(OS_ANDROID)
 const FeatureEntry::FeatureParam kPersistentMenuItemEnabled[] = {
     {"persistent_menu_item_enabled", "true"}};
 
 const FeatureEntry::FeatureVariation kDataReductionMainMenuFeatureVariations[] =
     {{"(persistent)", kPersistentMenuItemEnabled,
       arraysize(kPersistentMenuItemEnabled), nullptr}};
 #endif  // OS_ANDROID
 
 // RECORDING USER METRICS FOR FLAGS:
@@ skipping 1748 matching lines @@
 #endif  // OS_CHROMEOS
 
 #if defined(OS_ANDROID)
     {"use-new-doodle-api", flag_descriptions::kUseNewDoodleApiName,
      flag_descriptions::kUseNewDoodleApiDescription, kOsAndroid,
      FEATURE_WITH_PARAMS_VALUE_TYPE(chrome::android::kUseNewDoodleApi,
                                     kUseNewDoodleApiVariations,
                                     chrome::android::kUseNewDoodleApi.name)},
 #endif  // OS_ANDROID
 
+    {"memory-ablation", flag_descriptions::kMemoryAblationName,
+     flag_descriptions::kMemoryAblationDescription, kOsAll,
+     FEATURE_WITH_PARAMS_VALUE_TYPE(kMemoryAblationFeature,
+                                    kMemoryAblationFeatureVariations,
+                                    "MemoryAblation")},
+
 #if defined(OS_ANDROID)
     {"enable-custom-context-menu",
      flag_descriptions::kEnableCustomContextMenuName,
      flag_descriptions::kEnableCustomContextMenuDescription, kOsAndroid,
      FEATURE_VALUE_TYPE(chrome::android::kCustomContextMenu)},
 #endif  // OS_ANDROID
 
 #if defined(OS_CHROMEOS) || defined(OS_LINUX) || defined(OS_MACOSX) || \
     defined(OS_WIN)
     {pausetabs::kFeatureName, flag_descriptions::kPauseBackgroundTabsName,
@@ skipping 232 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags