Add runtime setting to force passive event listeners.

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 167 matching lines @@
   // so by default we want to avoid debugging that.
   // NOTE: As the default value must be the empty string, the mask excluding
   // 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},
     {IDS_MARK_NON_SECURE_AS_NON_SECURE,
      security_state::switches::kMarkNonSecureAs,
      security_state::switches::kMarkNonSecureAsNonSecure}};
 
 const FeatureEntry::Choice kDataReductionProxyLoFiChoices[] = {
     { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
@@ skipping 1662 matching lines @@
      IDS_FLAGS_MEDIA_STYLE_NOTIFICATION_DESCRIPTION, kOsAndroid,
      FEATURE_VALUE_TYPE(chrome::android::kMediaStyleNotification)},
     {"important-sites-in-cbd", IDS_FLAGS_IMPORTANT_SITES_IN_CBD_NAME,
      IDS_FLAGS_IMPORTANT_SITES_IN_CBD_DESCRIPTION, kOsAndroid,
      FEATURE_VALUE_TYPE(chrome::android::kImportantSitesInCBD)},
 #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)},
+
     // 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 179 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags