Initial implementation for sharing field trial state (win)

content/public/browser/browser_child_process_host.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_HOST_H_
 
 #include "base/environment.h"
+#include "base/memory/shared_memory.h"
 #include "base/process/kill.h"
 #include "base/process/process_handle.h"
 #include "base/strings/string16.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/public/common/process_type.h"
 #include "ipc/ipc_sender.h"
 
 #if defined(OS_MACOSX)
 #include "base/process/port_provider_mac.h"
@@ skipping 36 matching lines @@
       const std::string& service_name);
 
   // Returns the child process host with unique id |child_process_id|, or
   // nullptr if it doesn't exist. |child_process_id| is NOT the process ID, but
   // is the same unique ID as |ChildProcessData::id|.
   static BrowserChildProcessHost* FromID(int child_process_id);
 
   ~BrowserChildProcessHost() override {}
 
   // Derived classes call this to launch the child process asynchronously.
-  // Takes ownership of |cmd_line| and |delegate|.
-  virtual void Launch(
-      SandboxedProcessLauncherDelegate* delegate,
-      base::CommandLine* cmd_line,
-      bool terminate_on_shutdown) = 0;
+  // Takes ownership of |cmd_line| and |delegate|. Takes in |field_trial_state|
+  // to explicitly pass its handle to be inherited on Windows to the child
+  // process via the command line.
+  virtual void Launch(SandboxedProcessLauncherDelegate* delegate,
+                      base::CommandLine* cmd_line,
+                      const base::SharedMemory* field_trial_state,
+                      bool terminate_on_shutdown) = 0;
 
   virtual const ChildProcessData& GetData() const = 0;
 
   // Returns the ChildProcessHost object used by this object.
   virtual ChildProcessHost* GetHost() const = 0;
 
   // Returns the termination status of a child.  |exit_code| is the
   // status returned when the process exited (for posix, as returned
   // from waitpid(), for Windows, as returned from
   // GetExitCodeProcess()).  |exit_code| may be nullptr.
@@ skipping 19 matching lines @@
 
 #if defined(OS_MACOSX)
   // Returns a PortProvider used to get the task port for child processes.
   static base::PortProvider* GetPortProvider();
 #endif
 };
 
 };  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_HOST_H_