Implement support for link type serviceworker in link elements.

third_party/WebKit/Source/core/html/HTMLLinkElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLLinkElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLLinkElement.cpp b/third_party/WebKit/Source/core/html/HTMLLinkElement.cpp
index 6bc0897a56d9bcfb50e61291919ab2641b6485f9..dc4c9a340fc56ba6365348eb8d97c82b4a530f75 100644
--- a/third_party/WebKit/Source/core/html/HTMLLinkElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLLinkElement.cpp
@@ -45,6 +45,7 @@
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/html/CrossOriginAttribute.h"
 #include "core/html/LinkManifest.h"
+#include "core/html/LinkServiceWorker.h"
 #include "core/html/imports/LinkImport.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/loader/FrameLoader.h"
@@ -193,6 +194,9 @@ void HTMLLinkElement::parseAttribute(const QualifiedName& name, const AtomicStri
     } else if (name == mediaAttr) {
         m_media = value.lower();
         process();
+    } else if (name == scopeAttr) {
+        m_scope = value;
+        process();
     } else if (name == disabledAttr) {
         UseCounter::count(document(), UseCounter::HTMLLinkElementDisabled);
         if (LinkStyle* link = linkStyle())
@@ -230,6 +234,8 @@ LinkResource* HTMLLinkElement::linkResourceToProcess()
             m_link = LinkImport::create(this);
         } else if (m_relAttribute.isManifest()) {
             m_link = LinkManifest::create(this);
+        } else if (RuntimeEnabledFeatures::linkServiceworkerEnabled() && m_relAttribute.isServiceWorker()) {
+            m_link = LinkServiceWorker::create(this);
         } else {
             OwnPtrWillBeRawPtr<LinkStyle> link = LinkStyle::create(this);
             if (fastHasAttribute(disabledAttr)) {