[Tracing] Expose trace serialization as part of tracing interface

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/dcheck_always_on.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
@@ skipping 2146 matching lines @@
     "include/libplatform/libplatform.h",
     "include/libplatform/v8-tracing.h",
     "src/libplatform/default-platform.cc",
     "src/libplatform/default-platform.h",
     "src/libplatform/task-queue.cc",
     "src/libplatform/task-queue.h",
     "src/libplatform/tracing/trace-buffer.cc",
     "src/libplatform/tracing/trace-buffer.h",
     "src/libplatform/tracing/trace-config.cc",
     "src/libplatform/tracing/trace-object.cc",
+    "src/libplatform/tracing/trace-serializer.cc",
     "src/libplatform/tracing/trace-writer.cc",
     "src/libplatform/tracing/trace-writer.h",
     "src/libplatform/tracing/tracing-controller.cc",
     "src/libplatform/worker-thread.cc",
     "src/libplatform/worker-thread.h",
   ]
 
   configs = [ ":internal_config_base" ]
 
   public_configs = [ ":libplatform_config" ]
@@ skipping 418 matching lines @@
 
   deps = [
     ":fuzzer_support",
   ]
 
   configs = [ ":internal_config" ]
 }
 
 v8_fuzzer("wasm_code_fuzzer") {
 }