[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/core/exported/BUILD.gn

 # 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.
 import("//third_party/WebKit/Source/core/core.gni")
 
 blink_core_sources("exported") {
   sources = [
     "SharedWorkerRepositoryClientImpl.cpp",
     "SharedWorkerRepositoryClientImpl.h",
     "WebArrayBuffer.cpp",
@@ skipping 71 matching lines @@
     "WebSettingsImpl.cpp",
     "WebSettingsImpl.h",
     "WebSharedWorkerImpl.cpp",
     "WebSharedWorkerImpl.h",
     "WebSurroundingText.cpp",
     "WebTextCheckingCompletionImpl.cpp",
     "WebTextCheckingCompletionImpl.h",
     "WebTextCheckingResult.cpp",
     "WebUserGestureIndicator.cpp",
     "WebUserGestureToken.cpp",
+    "WebV8ContextSnapshot.cpp",
     "WebViewBase.h",
   ]
 
   jumbo_excluded_sources = [
     # Too many different toElement (ListedElement and Node). https://crbug.com/738389
     "WebSearchableFormData.cpp",
   ]
 
   defines = [ "BLINK_IMPLEMENTATION=1" ]
 }