Initial implementation for sharing field trial state (win)

content/browser/browser_child_process_host_impl.h

Index: content/browser/browser_child_process_host_impl.h
diff --git a/content/browser/browser_child_process_host_impl.h b/content/browser/browser_child_process_host_impl.h
index 43cd8bebc276fc86113f28bc3df96f6bb4824306..8c07141f9eb6b9aab800278378e7d636c6f0e87e 100644
--- a/content/browser/browser_child_process_host_impl.h
+++ b/content/browser/browser_child_process_host_impl.h
@@ -24,6 +24,7 @@
 #include "content/public/common/child_process_host_delegate.h"
 
 #if defined(OS_WIN)
+#include "base/memory/shared_memory.h"
 #include "base/win/object_watcher.h"
 #endif
 
@@ -65,11 +66,19 @@ class CONTENT_EXPORT BrowserChildProcessHostImpl
   // Copies kEnableFeatures and kDisableFeatures to the command line. Generates
   // them from the FeatureList override state, to take into account overrides
   // from FieldTrials.
+  #if defined(OS_WIN)
+  static void CopyFeatureAndFieldTrialFlags(base::CommandLine* cmd_line,
+                                            base::SharedMemory* shared_memory);
+  #else
   static void CopyFeatureAndFieldTrialFlags(base::CommandLine* cmd_line);
+  #endif
 
   // BrowserChildProcessHost implementation:
   bool Send(IPC::Message* message) override;
   void Launch(SandboxedProcessLauncherDelegate* delegate,
+  #if defined(OS_WIN)
+              HANDLE field_trial_handle,
+  #endif
               base::CommandLine* cmd_line,
               bool terminate_on_shutdown) override;
   const ChildProcessData& GetData() const override;