[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/bindings/modules/v8/generated.gni

 # 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/chrome_build.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/core/core_idl_files.gni")
 import("//third_party/WebKit/Source/modules/modules_idl_files.gni")
 
 bindings_modules_v8_output_dir = "$bindings_output_dir/modules/v8"
@@ skipping 78 matching lines @@
           "$bindings_modules_v8_output_dir/V8{{source_name_part}}.h",
         ])
 
 bindings_modules_generated_partial_interface_files =
     process_file_template(
         core_idl_with_modules_dependency_files,
         [
           "$bindings_modules_v8_output_dir/V8{{source_name_part}}Partial.cpp",
           "$bindings_modules_v8_output_dir/V8{{source_name_part}}Partial.h",
         ])
+
+bindings_generated_reference_files =
+    [ "$bindings_modules_v8_output_dir/V8SnapshotReference.cpp" ]