Initial implementation for sharing field trial state (win)

content/app/content_main_runner.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 "content/public/app/content_main_runner.h"
 
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ skipping 14 matching lines @@
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_base.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/path_service.h"
 #include "base/process/launch.h"
 #include "base/process/memory.h"
+#include "base/process/process.h"

[Alexei Svitkine (slow), 2016/10/06 21:39:28]

Is this include needed?

[lawrencewu, 2016/10/07 15:07:21]

Nope. Removed.

 #include "base/process/process_handle.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
 #include "components/tracing/browser/trace_config_file.h"
 #include "components/tracing/common/trace_to_console.h"
 #include "components/tracing/common/tracing_switches.h"
@@ skipping 93 matching lines @@
       *base::CommandLine::ForCurrentProcess();
 
   // Initialize statistical testing infrastructure.  We set the entropy
   // provider to nullptr to disallow non-browser processes from creating
   // their own one-time randomized trials; they should be created in the
   // browser process.
   field_trial_list->reset(new base::FieldTrialList(nullptr));
 
   // Ensure any field trials in browser are reflected into the child
   // process.
-  if (command_line.HasSwitch(switches::kForceFieldTrials)) {
-    bool result = base::FieldTrialList::CreateTrialsFromString(
-        command_line.GetSwitchValueASCII(switches::kForceFieldTrials),
-        std::set<std::string>());
-    DCHECK(result);
-  }
+  base::FieldTrialList::CreateTrialsFromCommandLine(
+      command_line, switches::kFieldTrialHandle);
 
   std::unique_ptr<base::FeatureList> feature_list(new base::FeatureList);
   feature_list->InitializeFromCommandLine(
       command_line.GetSwitchValueASCII(switches::kEnableFeatures),
       command_line.GetSwitchValueASCII(switches::kDisableFeatures));
   base::FeatureList::SetInstance(std::move(feature_list));
 }
 
 }  // namespace
 
@@ skipping 677 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ContentMainRunnerImpl);
 };
 
 // static
 ContentMainRunner* ContentMainRunner::Create() {
   return new ContentMainRunnerImpl();
 }
 
 }  // namespace content