[wasm] Add UTF-8 validation

BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 if (is_android) {
@@ skipping 1461 matching lines @@
     "src/wasm/ast-decoder.cc",
     "src/wasm/ast-decoder.h",
     "src/wasm/decoder.h",
     "src/wasm/encoder.cc",
     "src/wasm/encoder.h",
     "src/wasm/leb-helper.h",
     "src/wasm/module-decoder.cc",
     "src/wasm/module-decoder.h",
     "src/wasm/switch-logic.cc",
     "src/wasm/switch-logic.h",
+    "src/wasm/utf8.cc",
+    "src/wasm/utf8.h",
     "src/wasm/wasm-external-refs.cc",
     "src/wasm/wasm-external-refs.h",
     "src/wasm/wasm-function-name-table.cc",
     "src/wasm/wasm-function-name-table.h",
     "src/wasm/wasm-js.cc",
     "src/wasm/wasm-js.h",
     "src/wasm/wasm-macro-gen.h",
     "src/wasm/wasm-module.cc",
     "src/wasm/wasm-module.h",
     "src/wasm/wasm-opcodes.cc",
@@ skipping 758 matching lines @@
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
   configs += [
     ":internal_config",
     ":libplatform_config",
     ":features",
     ":toolchain",
   ]
 }