Add a field trial to enable out-of-process V8 pac.

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 482 matching lines @@
     switches::kSupervisedUserSafeSites,
     "disabled" },
   { IDS_SUPERVISED_USER_SAFESITES_BLACKLIST_ONLY,
     switches::kSupervisedUserSafeSites,
     "blacklist-only" },
   { IDS_SUPERVISED_USER_SAFESITES_ONLINE_CHECK_ONLY,
     switches::kSupervisedUserSafeSites,
     "online-check-only" }
 };
 
+const Experiment::Choice kV8PacChoices[] = {
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
+  { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
+    switches::kV8PacMojoOutOfProcess,
+    "enabled" },
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
+    switches::kDisableOutOfProcessPac,
+    "disabled" }
+};
+
 // RECORDING USER METRICS FOR FLAGS:
 // -----------------------------------------------------------------------------
 // The first line of the experiment is the internal name. If you'd like to
 // gather statistics about the usage of your flag, you should append a marker
 // comment to the end of the feature name, like so:
 //   "my-special-feature",  // FLAGS:RECORD_UMA
 //
 // After doing that, run
 //   tools/metrics/actions/extract_actions.py
 // to add the metric to actions.xml (which will enable UMA to record your
@@ skipping 1813 matching lines @@
     IDS_FLAGS_OZONE_TEST_SINGLE_HARDWARE_OVERLAY_DESCRIPTION,
     kOsCrOS,
     SINGLE_VALUE_TYPE(switches::kOzoneTestSingleOverlaySupport)
   },
 #endif  // defined(OS_CHROMEOS) && defined(USE_OZONE)
   {
     "v8-pac-mojo-out-of-process",
     IDS_FLAGS_V8_PAC_MOJO_OUT_OF_PROCESS_NAME,
     IDS_FLAGS_V8_PAC_MOJO_OUT_OF_PROCESS_DESCRIPTION,
     kOsDesktop,
-    SINGLE_VALUE_TYPE(switches::kV8PacMojoOutOfProcess),
+    MULTI_VALUE_TYPE(kV8PacChoices),

[Alexei Svitkine (slow), 2015/05/15 14:33:42]

Nit: Use ENABLE_DISABLE_VALUE_TYPE() instead.

[Anand Mistry (off Chromium), 2015/05/15 18:47:58]

Done.

   },
 #if defined(ENABLE_MEDIA_ROUTER)
   {
     "enable-media-router",
     IDS_FLAGS_ENABLE_MEDIA_ROUTER_NAME,
     IDS_FLAGS_ENABLE_MEDIA_ROUTER_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kEnableMediaRouter)
   },
 #endif  // defined(ENABLE_MEDIA_ROUTER)
@@ skipping 650 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags