Allow for pausing background tabs on desktop via about:flags.

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>
@@ skipping 18 matching lines @@
 #include "chrome/browser/flag_descriptions.h"
 #include "chrome/browser/ntp_snippets/ntp_snippets_features.h"
 #include "chrome/browser/page_load_metrics/experiments/delay_navigation_throttle.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"
 #include "chrome/grit/chromium_strings.h"
 #include "components/autofill/core/browser/autofill_experiments.h"
 #include "components/autofill/core/common/autofill_switches.h"
 #include "components/browser_sync/browser_sync_switches.h"
 #include "components/cloud_devices/common/cloud_devices_switches.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_features.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_switches.h"
 #include "components/dom_distiller/core/dom_distiller_switches.h"
 #include "components/error_page/common/error_page_switches.h"
 #include "components/flags_ui/feature_entry.h"
@@ skipping 654 matching lines @@
 const FeatureEntry::FeatureParam kSpeculativeResourcePrefetchingLearning[] = {
     {predictors::kModeParamName, predictors::kLearningMode}};
 
 const FeatureEntry::FeatureVariation
     kSpeculativeResourcePrefetchingFeatureVariations[] = {
         {"Prefetching", kSpeculativeResourcePrefetchingPrefetching,
          arraysize(kSpeculativeResourcePrefetchingPrefetching), nullptr},
         {"Learning", kSpeculativeResourcePrefetchingLearning,
          arraysize(kSpeculativeResourcePrefetchingLearning), nullptr}};
 
+const FeatureEntry::FeatureParam kPauseBackgroundTabsMinimalEngagment[] = {
+    {pausetabs::kPauseBackgroundTabsFeatureParameterName,
+     pausetabs::kPauseBackgroundTabsFeatureModeParameterMinimal}};
+
+const FeatureEntry::FeatureParam kPauseBackgroundTabsLowEngagment[] = {
+    {pausetabs::kPauseBackgroundTabsFeatureParameterName,
+     pausetabs::kPauseBackgroundTabsFeatureModeParameterLow}};
+
+const FeatureEntry::FeatureParam kPauseBackgroundTabsMediumEngagment[] = {
+    {pausetabs::kPauseBackgroundTabsFeatureParameterName,
+     pausetabs::kPauseBackgroundTabsFeatureModeParameterMedium}};
+
+const FeatureEntry::FeatureParam kPauseBackgroundTabsHighEngagment[] = {
+    {pausetabs::kPauseBackgroundTabsFeatureParameterName,
+     pausetabs::kPauseBackgroundTabsFeatureModeParameterHigh}};
+
+const FeatureEntry::FeatureParam kPauseBackgroundTabsMaxEngagment[] = {
+    {pausetabs::kPauseBackgroundTabsFeatureParameterName,
+     pausetabs::kPauseBackgroundTabsFeatureModeParameterMax}};
+
+const FeatureEntry::FeatureVariation kPauseBackgroundTabsVariations[] = {
+    {"minimal engagement", kPauseBackgroundTabsMinimalEngagment,
+     arraysize(kPauseBackgroundTabsMinimalEngagment), nullptr},
+    {"low engagement", kPauseBackgroundTabsLowEngagment,
+     arraysize(kPauseBackgroundTabsLowEngagment), nullptr},
+    {"medium engagement", kPauseBackgroundTabsMediumEngagment,
+     arraysize(kPauseBackgroundTabsMediumEngagment), nullptr},
+    {"high engagement", kPauseBackgroundTabsHighEngagment,
+     arraysize(kPauseBackgroundTabsHighEngagment), nullptr},
+    {"max engagement", kPauseBackgroundTabsMaxEngagment,
+     arraysize(kPauseBackgroundTabsMaxEngagment), nullptr}};
+
 #if defined(OS_ANDROID)
 const FeatureEntry::FeatureParam
 kAutofillCreditCardPopupLayoutFeatureVariationIconAtStart[] = {
   {"is_credit_card_icon_at_start", "true"}};
 
 const FeatureEntry::FeatureParam
 kAutofillCreditCardPopupLayoutFeatureVariationDropdownItemHeight[] = {
   {"dropdown_item_height", "56"}};
 
 const FeatureEntry::FeatureParam
@@ skipping 1842 matching lines @@
                                     kDelayNavigationFeatureVariations,
                                     "DelayNavigation")},
 
 #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)
+    {"pause-background-tabs", flag_descriptions::kPauseBackgroundTabsName,
+     flag_descriptions::kPauseBackgroundTabsDescription, kOsDesktop,
+     FEATURE_WITH_PARAMS_VALUE_TYPE(pausetabs::kPauseBackgroundTabsFeature,
+                                    kPauseBackgroundTabsVariations,
+                                    "PauseBackgroundTabs")},
+#endif
+
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.
 };
 
 class FlagsStateSingleton {
  public:
   FlagsStateSingleton()
       : flags_state_(kFeatureEntries, arraysize(kFeatureEntries)) {}
   ~FlagsStateSingleton() {}
@@ skipping 188 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags