Adding flag to specify the used memory pressure strategy

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 266 matching lines @@
 const Experiment::Choice kEnableGpuRasterizationChoices[] = {
   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
     switches::kEnableGpuRasterization, "" },
   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
     switches::kDisableGpuRasterization, "" },
   { IDS_FLAGS_FORCE_GPU_RASTERIZATION,
     switches::kForceGpuRasterization, "" },
 };
 
+#if defined(OS_CHROMEOS)
+const Experiment::Choice kMemoryPressureThresholdChoices[] = {
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
+  { IDS_FLAGS_CONSERVATIVE_THRESHOLDS,
+    chromeos::switches::kMemoryPressureThresholds, "1" },
+  { IDS_FLAGS_AGGRESSIVE_CACHE_DISCARD_THRESHOLDS,
+    chromeos::switches::kMemoryPressureThresholds, "2" },
+  { IDS_FLAGS_AGGRESSIVE_TAB_DISCARD_THRESHOLDS,
+    chromeos::switches::kMemoryPressureThresholds, "3" },
+  { IDS_FLAGS_AGGRESSIVE_THRESHOLDS,
+    chromeos::switches::kMemoryPressureThresholds, "4" },
+};
+#endif
+
 // We're using independent flags here (as opposed to a common flag with
 // different values) to be able to enable/disable the entire experience
 // associated with this feature server-side from the FieldTrial (the complete
 // experience includes other flag changes as well). It is not currently possible
 // to do that with "flag=value" flags.
 const Experiment::Choice kSearchButtonInOmniboxChoices[] = {
   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
     switches::kDisableSearchButtonInOmnibox, ""},
   { IDS_FLAGS_SEARCH_BUTTON_IN_OMNIBOX_ENABLE_FOR_STR,
@@ skipping 1699 matching lines @@
 #endif
 #if defined(OS_CHROMEOS)
   {
     "disable-memory-pressure-chromeos",
     IDS_FLAGS_DISABLE_MEMORY_PRESSURE_NAME,
     IDS_FLAGS_DISABLE_MEMORY_PRESSURE_DESCRIPTION,
     kOsCrOS,
     SINGLE_VALUE_TYPE(chromeos::switches::kDisableMemoryPressureSystemChromeOS)
   },
   {
+    "memory-pressure-thresholds",
+    IDS_FLAGS_MEMORY_PRESSURE_THRESHOLD_NAME,
+    IDS_FLAGS_MEMORY_PRESSURE_THRESHOLD_DESCRIPTION,
+    kOsCrOS,
+    MULTI_VALUE_TYPE(kMemoryPressureThresholdChoices)
+  },
+  {
     "wake-on-packets",
     IDS_FLAGS_WAKE_ON_PACKETS_NAME,
     IDS_FLAGS_WAKE_ON_PACKETS_DESCRIPTION,
     kOsCrOSOwnerOnly,
     SINGLE_VALUE_TYPE(chromeos::switches::kWakeOnPackets)
   },
 #endif  // OS_CHROMEOS
   {
     "enable-tab-audio-muting",
     IDS_FLAGS_ENABLE_TAB_AUDIO_MUTING_NAME,
@@ skipping 682 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags