[scheduler] Throttle background frames with 1% CPU limit

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 1461 matching lines @@
      IDS_FLAGS_RESOLVE_TIMEZONE_BY_GEOLOCATION_NAME,
      IDS_FLAGS_RESOLVE_TIMEZONE_BY_GEOLOCATION_DESCRIPTION, kOsCrOS,
      SINGLE_DISABLE_VALUE_TYPE(
          chromeos::switches::kDisableTimeZoneTrackingOption)},
 #endif  // OS_CHROMEOS
     {"data-reduction-proxy-lo-fi", IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_NAME,
      IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_DESCRIPTION, kOsAll,
      MULTI_VALUE_TYPE(kDataReductionProxyLoFiChoices)},
     {"enable-data-reduction-proxy-lite-page",
      IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_LITE_PAGE_NAME,
-     IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_LITE_PAGE_DESCRIPTION,
-     kOsAll, SINGLE_VALUE_TYPE(data_reduction_proxy::switches::
-                                   kEnableDataReductionProxyLitePage)},
+     IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_LITE_PAGE_DESCRIPTION, kOsAll,
+     SINGLE_VALUE_TYPE(
+         data_reduction_proxy::switches::kEnableDataReductionProxyLitePage)},
     {"clear-data-reduction-proxy-data-savings",
      IDS_FLAGS_DATA_REDUCTION_PROXY_RESET_SAVINGS_NAME,
      IDS_FLAGS_DATA_REDUCTION_PROXY_RESET_SAVINGS_DESCRIPTION, kOsAll,
      SINGLE_VALUE_TYPE(
          data_reduction_proxy::switches::kClearDataReductionProxyDataSavings)},
     {"allow-insecure-localhost", IDS_ALLOW_INSECURE_LOCALHOST,
      IDS_ALLOW_INSECURE_LOCALHOST_DESCRIPTION, kOsAll,
      SINGLE_VALUE_TYPE(switches::kAllowInsecureLocalhost)},
     {"enable-add-to-shelf", IDS_FLAGS_ADD_TO_SHELF_NAME,
      IDS_FLAGS_ADD_TO_SHELF_DESCRIPTION, kOsDesktop,
@@ skipping 509 matching lines @@
      IDS_FLAGS_ARC_USE_AUTH_ENDPOINT_DESCRIPTION, kOsCrOS,
      SINGLE_VALUE_TYPE_AND_VALUE(
          chromeos::switches::kArcUseAuthEndpoint,
          "https://www-googleapis-staging.sandbox.google.com/oauth2/v4/"
          "ExchangeToken")},
 #endif  // OS_CHROMEOS
     {"material-security-verbose", IDS_FLAGS_MATERIAL_SECURITY_VERBOSE_NAME,
      IDS_FLAGS_MATERIAL_SECURITY_VERBOSE_DESCRIPTION, kOsDesktop,
      MULTI_VALUE_TYPE(kSecurityVerboseChoices)},
 #if defined(OS_CHROMEOS)
-    {"arc-boot-completed-broadcast",
-     IDS_FLAGS_ARC_BOOT_COMPLETED,
+    {"arc-boot-completed-broadcast", IDS_FLAGS_ARC_BOOT_COMPLETED,
      IDS_FLAGS_ARC_BOOT_COMPLETED_DESCRIPTION, kOsCrOS,
      FEATURE_VALUE_TYPE(arc::kBootCompletedBroadcastFeature)},
 #endif
 #if defined(OS_WIN)
     {"disable-winrt-midi-api", IDS_FLAGS_DISABLE_WINRT_MIDI_API_NAME,
      IDS_FLAGS_DISABLE_WINRT_MIDI_API_DESCRIPTION, kOsWin,
      SINGLE_DISABLE_VALUE_TYPE(switches::kDisableWinrtMidiApi)},
 #endif  // OS_WIN
     {"saveas-menu-text-experiment", IDS_FLAGS_SAVEAS_MENU_LABEL_EXPERIMENT_NAME,
      IDS_FLAGS_SAVEAS_MENU_LABEL_EXPERIMENT_DESCRIPTION, kOsDesktop,
      SINGLE_VALUE_TYPE(switches::kEnableSaveAsMenuLabelExperiment)},
     {"enable-generic-sensor", IDS_FLAGS_ENABLE_GENERIC_SENSOR_NAME,
      IDS_FLAGS_ENABLE_GENERIC_SENSOR_DESCRIPTION, kOsAndroid | kOsMac,
      FEATURE_VALUE_TYPE(features::kGenericSensor)},
+    {"expensive-background-timer-throttling",
+     IDS_FLAGS_EXPENSIVE_BACKGROUND_TIMER_THROTTLING_NAME,
+     IDS_FLAGS_EXPENSIVE_BACKGROUND_TIMER_THROTTLING_DESCRIPTION, kOsAll,
+     FEATURE_VALUE_TYPE(features::kExpensiveBackgroundTimerThrottling)},
     // 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