Initial implementation for sharing field trial state (win)

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 a8e866010eec06dfa0690ae2391ff42f0dc42b20..d46acd2fc7f7a2128a05ebe71fff1b8eb30c95a2 100644
--- a/content/app/content_main_runner.cc
+++ b/content/app/content_main_runner.cc
@@ -32,6 +32,7 @@
 #include "base/path_service.h"
 #include "base/process/launch.h"
 #include "base/process/memory.h"
+#include "base/process/process.h"
 #include "base/process/process_handle.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_number_conversions.h"
@@ -142,12 +143,8 @@ void InitializeFieldTrialAndFeatureList(
 
   // 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(