Move gin and v8 portion of profiling to child from common

chrome/child/child_profiling.h

+// Copyright 2017 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 CHROME_CHILD_CHILD_PROFILING_H_
+#define CHROME_CHILD_CHILD_PROFILING_H_
+
+#include "base/macros.h"
+
+// This class is the child-process-only (i.e. non-browser) portion of
+// chrome/common/profiling.h.
+class ChildProfiling {
+ public:
+  // Called early in a process' life to allow profiling of startup time.
+  static void ProcessStarted();
+
+ private:
+  ChildProfiling();
+  DISALLOW_COPY_AND_ASSIGN(ChildProfiling);
+};
+
+#endif  // CHROME_CHILD_CHILD_PROFILING_H_