Share field trial allocator on zygote-using Linuxes

content/app/content_main_runner.cc

Index: content/app/content_main_runner.cc
diff --git a/content/app/content_main_runner.cc b/content/app/content_main_runner.cc
index 9d92e28e19c5d1133b7af61925cf10f53b04fe4d..695f8511ebe144f0dabe48b5951be28e5cb041f5 100644
--- a/content/app/content_main_runner.cc
+++ b/content/app/content_main_runner.cc
@@ -145,7 +145,7 @@ void InitializeFieldTrialAndFeatureList(
   // Ensure any field trials in browser are reflected into the child
   // process.
   base::FieldTrialList::CreateTrialsFromCommandLine(
-      command_line, switches::kFieldTrialHandle);
+      command_line, switches::kFieldTrialHandle, kFieldTrialHandle);
 
   std::unique_ptr<base::FeatureList> feature_list(new base::FeatureList);
   feature_list->InitializeFromCommandLine(
@@ -478,6 +478,9 @@ class ContentMainRunnerImpl : public ContentMainRunner {
     SetupSignalHandlers();
     g_fds->Set(kMojoIPCChannel,
                kMojoIPCChannel + base::GlobalDescriptors::kBaseDescriptor);
+
+    g_fds->Set(kFieldTrialHandle,
+               kFieldTrialHandle + base::GlobalDescriptors::kBaseDescriptor);
 #endif  // !OS_ANDROID
 
 #if defined(OS_LINUX) || defined(OS_OPENBSD)