Update from https://crrev.com/308331

base/process/process.h

 // Copyright (c) 2011 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 BASE_PROCESS_PROCESS_PROCESS_H_
 #define BASE_PROCESS_PROCESS_PROCESS_H_
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 #include "base/move.h"
 #include "base/process/process_handle.h"
+#include "base/time/time.h"
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include "base/win/scoped_handle.h"
 #endif
 
 namespace base {
 
 // Provides a move-only encapsulation of a process.
 //
@@ skipping 52 matching lines @@
   bool is_current() const;
 
   // Close the process handle. This will not terminate the process.
   void Close();
 
   // Terminates the process with extreme prejudice. The given |result_code| will
   // be the exit code of the process.
   // NOTE: On POSIX |result_code| is ignored.
   void Terminate(int result_code);
 
+  // Waits for the process to exit. Returns true on success.
+  // On POSIX, if the process has been signaled then |exit_code| is set to -1.
+  bool WaitForExit(int* exit_code);
+
+  // Same as WaitForExit() but only waits for up to |timeout|.
+  bool WaitForExitWithTimeout(TimeDelta timeout, int* exit_code);
+
   // A process is backgrounded when it's priority is lower than normal.
   // Return true if this process is backgrounded, false otherwise.
   bool IsProcessBackgrounded() const;
 
   // Set a process as backgrounded. If value is true, the priority of the
   // process will be lowered. If value is false, the priority of the process
   // will be made "normal" - equivalent to default process priority.
   // Returns true if the priority was changed, false otherwise.
   bool SetProcessBackgrounded(bool value);
 
   // Returns an integer representing the priority of a process. The meaning
   // of this value is OS dependent.
   int GetPriority() const;
 
  private:
 #if defined(OS_WIN)
   bool is_current_process_;
   win::ScopedHandle process_;
 #else
   ProcessHandle process_;
 #endif
 };
 
 }  // namespace base
 
 #endif  // BASE_PROCESS_PROCESS_PROCESS_H_