Add option to force document level passive event listeners as a runtime feature.

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 166 matching lines @@
   // the PNaCl translator and secure shell is substituted elsewhere.
   { IDS_NACL_DEBUG_MASK_CHOICE_EXCLUDE_UTILS_PNACL, "", "" },
   { IDS_NACL_DEBUG_MASK_CHOICE_DEBUG_ALL, switches::kNaClDebugMask, "*://*" },
   { IDS_NACL_DEBUG_MASK_CHOICE_INCLUDE_DEBUG,
       switches::kNaClDebugMask, "*://*/*debug.nmf" }
 };
 #endif
 
 const FeatureEntry::Choice kPassiveListenersChoices[] = {
     {IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
-    {IDS_FLAGS_PASSIVE_EVENT_LISTENER_DOCUMENT_TRUE,
-     switches::kPassiveListenersDefault, "documentonlytrue"},
     {IDS_FLAGS_PASSIVE_EVENT_LISTENER_TRUE, switches::kPassiveListenersDefault,
      "true"},
     {IDS_FLAGS_PASSIVE_EVENT_LISTENER_FORCE_ALL_TRUE,
      switches::kPassiveListenersDefault, "forcealltrue"},
 };
 
 const FeatureEntry::Choice kMarkNonSecureAsChoices[] = {
     {IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
     {IDS_MARK_NON_SECURE_AS_NEUTRAL, security_state::switches::kMarkNonSecureAs,
      security_state::switches::kMarkNonSecureAsNeutral},
@@ skipping 1724 matching lines @@
      FEATURE_VALUE_TYPE(features::kAutoplayMutedVideos)},
 #endif
     {"enable-pointer-events",  // FLAGS:RECORD_UMA
      IDS_FLAGS_EXPERIMENTAL_POINTER_EVENT_NAME,
      IDS_FLAGS_EXPERIMENTAL_POINTER_EVENT_DESCRIPTION, kOsAll,
      FEATURE_VALUE_TYPE(features::kPointerEvents)},
     {"passive-listener-default",  // FLAGS:RECORD_UMA
      IDS_FLAGS_PASSIVE_EVENT_LISTENER_DEFAULT_NAME,
      IDS_FLAGS_PASSIVE_EVENT_LISTENER_DEFAULT_DESCRIPTION, kOsAll,
      MULTI_VALUE_TYPE(kPassiveListenersChoices)},
+    {"document-passive-event-listeners",  // FLAGS:RECORD_UMA
+     IDS_FLAGS_PASSIVE_DOCUMENT_EVENT_LISTENERS_NAME,
+     IDS_FLAGS_PASSIVE_DOCUMENT_EVENT_LISTENERS_DESCRIPTION, kOsAll,
+     FEATURE_VALUE_TYPE(features::kPassiveDocumentEventListeners)},
     {"enable-loading-ipc-optimization-for-small-resources",
      IDS_FLAGS_OPTIMIZE_LOADING_IPC_FOR_SMALL_RESOURCES_NAME,
      IDS_FLAGS_OPTIMIZE_LOADING_IPC_FOR_SMALL_RESOURCES_DESCRIPTION, kOsAll,
      FEATURE_VALUE_TYPE(features::kOptimizeLoadingIPCForSmallResources)},
     {"enable-font-cache-scaling", IDS_FLAGS_FONT_CACHE_SCALING_NAME,
      IDS_FLAGS_FONT_CACHE_SCALING_DESCRIPTION, kOsAll,
      FEATURE_VALUE_TYPE(features::kFontCacheScaling)},
 #if defined(OS_ANDROID)
     {"enable-vr-shell", IDS_FLAGS_ENABLE_VR_SHELL_NAME,
      IDS_FLAGS_ENABLE_VR_SHELL_DESCRIPTION, kOsAndroid,
@@ skipping 215 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags