Implement support for link type serviceworker in link elements.

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 2934 matching lines @@
             'html/ImageDocument.h',
             'html/LabelableElement.cpp',
             'html/LabelsNodeList.cpp',
             'html/LabelsNodeList.h',
             'html/LinkManifest.cpp',
             'html/LinkManifest.h',
             'html/LinkRelAttribute.cpp',
             'html/LinkRelAttribute.h',
             'html/LinkResource.cpp',
             'html/LinkResource.h',
+            'html/LinkServiceWorker.cpp',
+            'html/LinkServiceWorker.h',
             'html/MediaDocument.cpp',
             'html/MediaDocument.h',
             'html/MediaError.h',
             'html/MediaFragmentURIParser.cpp',
             'html/MediaFragmentURIParser.h',
             'html/PluginDocument.cpp',
             'html/PluginDocument.h',
             'html/PublicURLManager.cpp',
             'html/PublicURLManager.h',
             'html/RadioNodeList.cpp',
@@ skipping 1094 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }