Turn on the fixed position stacking context flag by default

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 <algorithm>
 #include <iterator>
 #include <map>
 #include <set>
@@ skipping 88 matching lines @@
 const Experiment::Choice kOmniboxInlineHistoryQuickProviderChoices[] = {
   { IDS_FLAGS_OMNIBOX_INLINE_HISTORY_QUICK_PROVIDER_AUTOMATIC, "", "" },
   { IDS_FLAGS_OMNIBOX_INLINE_HISTORY_QUICK_PROVIDER_ALLOWED,
     switches::kOmniboxInlineHistoryQuickProvider,
     switches::kOmniboxInlineHistoryQuickProviderAllowed },
   { IDS_FLAGS_OMNIBOX_INLINE_HISTORY_QUICK_PROVIDER_PROHIBITED,
     switches::kOmniboxInlineHistoryQuickProvider,
     switches::kOmniboxInlineHistoryQuickProviderProhibited }
 };
 
+const Experiment::Choice kFixedPositionCreatesStackingContextChoices[] = {
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
+  { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
+    switches::kEnableFixedPositionCreatesStackingContext, ""},
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
+    switches::kDisableFixedPositionCreatesStackingContext, ""}
+};
+
 const Experiment::Choice kForceCompositingModeChoices[] = {
   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
     switches::kForceCompositingMode, ""},
   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
     switches::kDisableForceCompositingMode, ""}
 };
 
 const Experiment::Choice kThreadedCompositingModeChoices[] = {
   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
@@ skipping 178 matching lines @@
     IDS_FLAGS_DISABLE_WEBGL_NAME,
     IDS_FLAGS_DISABLE_WEBGL_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kDisableExperimentalWebGL)
   },
   {
     "fixed-position-creates-stacking-context",
     IDS_FLAGS_FIXED_POSITION_CREATES_STACKING_CONTEXT_NAME,
     IDS_FLAGS_FIXED_POSITION_CREATES_STACKING_CONTEXT_DESCRIPTION,
     kOsAll,
-    SINGLE_VALUE_TYPE(switches::kFixedPositionCreatesStackingContext)
+    MULTI_VALUE_TYPE(kFixedPositionCreatesStackingContextChoices)
   },
   // TODO(dspringer): When NaCl is on by default, remove this flag entry.
   {
     "enable-nacl",  // FLAGS:RECORD_UMA
     IDS_FLAGS_ENABLE_NACL_NAME,
     IDS_FLAGS_ENABLE_NACL_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kEnableNaCl)
   },
   // TODO(halyavin): When exception handling is on by default, replace this
@@ skipping 980 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags