Split out code to be shared between CheckedNumeric and ClampedNumeric

base/BUILD.gn

 # Copyright (c) 2013 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.
 
 # HOW TO WRITE CONDITIONALS IN THIS FILE
 # ======================================
 #
 # In many other places, one would write a conditional that expresses all the
 # cases when a source file is used or unused, and then either add or subtract
 # it from the sources list in that case
@@ skipping 575 matching lines @@
     "native_library.cc",
     "native_library.h",
     "native_library_ios.mm",
     "native_library_mac.mm",
     "native_library_posix.cc",
     "native_library_win.cc",
     "nix/mime_util_xdg.cc",
     "nix/mime_util_xdg.h",
     "nix/xdg_util.cc",
     "nix/xdg_util.h",
+    "numerics/checked_math.h",
+    "numerics/checked_math_impl.h",
     "numerics/safe_conversions.h",
     "numerics/safe_conversions_impl.h",
     "numerics/safe_math.h",
-    "numerics/safe_math_impl.h",
+    "numerics/safe_math_shared_impl.h",
     "numerics/saturated_arithmetic.h",
     "numerics/saturated_arithmetic_arm.h",
     "observer_list.h",
     "observer_list_threadsafe.h",
     "optional.h",
     "os_compat_android.cc",
     "os_compat_android.h",
     "os_compat_nacl.cc",
     "os_compat_nacl.h",
     "path_service.cc",
@@ skipping 2151 matching lines @@
 }
 
 fuzzer_test("base_json_correctness_fuzzer") {
   sources = [
     "json/correctness_fuzzer.cc",
   ]
   deps = [
     ":base",
   ]
 }