Add <link rel=preload> onload support for scripts and styles

third_party/WebKit/Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 1857 matching lines @@
             'loader/HistoryItem.cpp',
             'loader/HistoryItem.h',
             'loader/HttpEquiv.cpp',
             'loader/HttpEquiv.h',
             'loader/ImageLoader.cpp',
             'loader/ImageLoader.h',
             'loader/LinkHeader.cpp',
             'loader/LinkLoader.cpp',
             'loader/LinkLoader.h',
             'loader/LinkLoaderClient.h',
+            'loader/LinkPreloadResourceClients.cpp',
+            'loader/LinkPreloadResourceClients.h',
             'loader/MixedContentChecker.cpp',
             'loader/MixedContentChecker.h',
             'loader/NavigationPolicy.cpp',
             'loader/NavigationPolicy.h',
             'loader/NavigationScheduler.cpp',
             'loader/PingLoader.cpp',
             'loader/PingLoader.h',
             'loader/PrerenderHandle.cpp',
             'loader/PrerenderHandle.h',
             'loader/PrerendererClient.cpp',
@@ skipping 2121 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }