Implement support for link type serviceworker in link elements.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Rob Buis (rwlbuis@gmail.com)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 27 matching lines @@
 #include "core/fetch/CSSStyleSheetResource.h"
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/SubresourceIntegrity.h"
 #include "core/frame/UseCounter.h"
 #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"
 #include "core/loader/FrameLoaderClient.h"
 #include "core/loader/NetworkHintsInterface.h"
 #include "core/style/StyleInheritedData.h"
 #include "platform/ContentType.h"
 #include "platform/Histogram.h"
 #include "platform/MIMETypeRegistry.h"
 #include "platform/RuntimeEnabledFeatures.h"
@@ skipping 128 matching lines @@
         m_type = value;
         process();
     } else if (name == asAttr) {
         m_as = value;
         process();
     } else if (name == sizesAttr) {
         m_sizes->setValue(value);
     } 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())
             link->setDisabledState(!value.isNull());
     } else {
         if (name == titleAttr) {
             if (LinkStyle* link = linkStyle())
                 link->setSheetTitle(value);
         }
 
@@ skipping 17 matching lines @@
     if (!visible) {
         ASSERT(!linkStyle() || !linkStyle()->hasSheet());
         return nullptr;
     }
 
     if (!m_link) {
         if (m_relAttribute.isImport()) {
             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 {

[Yoav Weiss, 2016/03/17 11:21:13]

Unrelated to this CL but we really need to clean this up and get other links'
processing out of LinkStyle::process

[Marijn Kruisselbrink, 2016/03/17 19:53:34]

Agreed, although it's not trivial to do so and stay web compatible (technically
having different LinkResource implementations for different rel values already
isn't entirely spec compliant; it's perfectly legal according to the spec to
have a link element with <link rel="manifest serviceworker stylesheet">. That
would of course be pretty weird, and likely whatever href is specified for the
link will only load correctly for one of the different link types, but a browser
can't know which one it is without trying all of them).

So not sure what a cleaned up/redesigned HTMLLinkElement/LinkResource codebase
would look like, but it would be nice to somehow figure that out/clean this up.

             OwnPtrWillBeRawPtr<LinkStyle> link = LinkStyle::create(this);
             if (fastHasAttribute(disabledAttr)) {
                 UseCounter::count(document(), UseCounter::HTMLLinkElementDisabled);
                 link->setDisabledState(true);
             }
             m_link = link.release();
         }
     }
 
     return m_link.get();
@@ skipping 542 matching lines @@
 }
 
 DEFINE_TRACE(LinkStyle)
 {
     visitor->trace(m_sheet);
     LinkResource::trace(visitor);
     ResourceOwner<StyleSheetResource>::trace(visitor);
 }
 
 } // namespace blink