[Offline Pages] Adding missing image/CSS detection in FrameSerializer.

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 174 matching lines @@
     "WebMediaDeviceChangeObserver.cpp",
     "WebMediaDevicesRequest.cpp",
     "WebMediaStreamRegistry.cpp",
     "WebMemoryStatistics.cpp",
     "WebMetaElement.cpp",
     "WebNode.cpp",
     "WebOptionElement.cpp",
     "WebPageImportanceSignals.cpp",
     "WebPagePopupImpl.cpp",
     "WebPagePopupImpl.h",
+    "WebPageProblemDetector.cpp",
+    "WebPageProblemDetector.h",
     "WebPepperSocket.cpp",
     "WebPepperSocketChannelClientProxy.h",
     "WebPepperSocketImpl.cpp",
     "WebPepperSocketImpl.h",
     "WebPerformance.cpp",
     "WebPluginContainerImpl.cpp",
     "WebPluginContainerImpl.h",
     "WebPluginDocument.cpp",
     "WebPluginScriptForbiddenScope.cpp",
     "WebRange.cpp",
@@ skipping 221 matching lines @@
 
   if (is_android) {
     deps += [
       "//base:base_java",
       "//content/public/android:content_java",
       "//content/shell/android:content_shell_assets",
       "//net/android:net_java",
     ]
   }
 }