Use a two-part data format version in IndexedDB metadata.

third_party/WebKit/Source/web/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/ui.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 import("//third_party/WebKit/Source/modules/modules.gni")
@@ skipping 222 matching lines @@
     "WebScopedUserGesture.cpp",
     "WebScopedWindowFocusAllowedIndicator.cpp",
     "WebScriptController.cpp",
     "WebScriptSource.cpp",
     "WebSearchableFormData.cpp",
     "WebSecurityPolicy.cpp",
     "WebSelectElement.cpp",
     "WebSelection.cpp",
     "WebSelector.cpp",
     "WebSerializedScriptValue.cpp",
+    "WebSerializedScriptValueVersion.cpp",
     "WebSettingsImpl.cpp",
     "WebSettingsImpl.h",
     "WebSharedWorkerImpl.cpp",
     "WebSharedWorkerImpl.h",
     "WebSharedWorkerReportingProxyImpl.cpp",
     "WebSharedWorkerReportingProxyImpl.h",
     "WebSpeechGrammar.cpp",
     "WebSpeechRecognitionHandle.cpp",
     "WebSpeechRecognitionResult.cpp",
     "WebStorageEventDispatcherImpl.cpp",
@@ skipping 196 matching lines @@
 
   if (is_android) {
     deps += [
       "//base:base_java",
       "//content/public/android:content_java",
       "//content/shell/android:content_shell_assets",
       "//net/android:net_java",
     ]
   }
 }