Use SharedPersistentMemoryAllocator to share field trial state

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 948 matching lines @@
     base::CommandLine* cmd_line = new base::CommandLine(renderer_path);
     if (!renderer_prefix.empty())
       cmd_line->PrependWrapper(renderer_prefix);
     AppendRendererCommandLine(cmd_line);
 
     // Spawn the child process asynchronously to avoid blocking the UI thread.
     // As long as there's no renderer prefix, we can use the zygote process
     // at this stage.
     child_process_launcher_.reset(new ChildProcessLauncher(
         new RendererSandboxedProcessLauncherDelegate(channel_.get()), cmd_line,
-        GetID(), this, field_trial_state_.get(), child_token_,
+        GetID(), this, child_token_,
         base::Bind(&RenderProcessHostImpl::OnMojoError, id_)));
     channel_->Pause();
 
     fast_shutdown_started_ = false;
   }
 
   // Push any pending messages to the channel now. Note that if the child
   // process is still launching, the channel will be paused and outgoing
   // messages will be queued internally by the channel.
   while (!queued_messages_.empty()) {
@@ skipping 841 matching lines @@
 #endif
 #if defined(ENABLE_IPC_FUZZER)
     switches::kIpcDumpDirectory,
     switches::kIpcFuzzerTestcase,
 #endif
     switches::kUseMusInRenderer,
   };
   renderer_cmd->CopySwitchesFrom(browser_cmd, kSwitchNames,
                                  arraysize(kSwitchNames));
 
-  field_trial_state_ =
-      BrowserChildProcessHostImpl::CopyFeatureAndFieldTrialFlags(renderer_cmd);
+  BrowserChildProcessHostImpl::CopyFeatureAndFieldTrialFlags(renderer_cmd);
 
   if (browser_cmd.HasSwitch(switches::kTraceStartup) &&
       BrowserMainLoop::GetInstance()->is_tracing_startup_for_duration()) {
     // Pass kTraceStartup switch to renderer only if startup tracing has not
     // finished.
     renderer_cmd->AppendSwitchASCII(
         switches::kTraceStartup,
         browser_cmd.GetSwitchValueASCII(switches::kTraceStartup));
   }
 
@@ skipping 1187 matching lines @@
   LOG(ERROR) << "Terminating render process for bad Mojo message: " << error;
 
   // The ReceivedBadMessage call below will trigger a DumpWithoutCrashing. Alias
   // enough information here so that we can determine what the bad message was.
   base::debug::Alias(&error);
   bad_message::ReceivedBadMessage(render_process_id,
                                   bad_message::RPH_MOJO_PROCESS_ERROR);
 }
 
 }  // namespace content