Implement updateViaCache flag and no-cache by default for main service worker scripts

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
@@ skipping 27 matching lines @@
 #include "core/html/imports/LinkImport.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/loader/NetworkHintsInterface.h"
 #include "core/origin_trials/OriginTrials.h"
 #include "platform/weborigin/SecurityPolicy.h"
 #include "public/platform/WebIconSizesParser.h"
 #include "public/platform/WebSize.h"
 
 namespace blink {
 
+namespace {
+WebServiceWorkerUpdateViaCache ParseUpdateViaCache(const AtomicString& value) {
+  if (value == "imports")
+    return WebServiceWorkerUpdateViaCache::kImports;
+  if (value == "all")
+    return WebServiceWorkerUpdateViaCache::kAll;
+  if (value == "none")
+    return WebServiceWorkerUpdateViaCache::kNone;
+  // Default value
+  return WebServiceWorkerUpdateViaCache::kImports;
+}
+}  // namespace
+
 using namespace HTMLNames;
 
 inline HTMLLinkElement::HTMLLinkElement(Document& document,
                                         bool created_by_parser)
     : HTMLElement(linkTag, document),
       link_loader_(LinkLoader::Create(this)),
       sizes_(DOMTokenList::Create(*this, HTMLNames::sizesAttr)),
       rel_list_(this, RelList::Create(this)),
       created_by_parser_(created_by_parser) {}
 
@@ skipping 37 matching lines @@
     icon_sizes_.resize(web_icon_sizes.size());
     for (size_t i = 0; i < web_icon_sizes.size(); ++i)
       icon_sizes_[i] = web_icon_sizes[i];
     Process();
   } else if (name == mediaAttr) {
     media_ = value.DeprecatedLower();
     Process();
   } else if (name == scopeAttr) {
     scope_ = value;
     Process();
+  } else if (name == updateviacacheAttr) {
+    update_via_cache_ = ParseUpdateViaCache(value);
+    Process();
   } else if (name == disabledAttr) {
     UseCounter::Count(GetDocument(), WebFeature::kHTMLLinkElementDisabled);
     if (LinkStyle* link = GetLinkStyle())
       link->SetDisabledState(!value.IsNull());
   } else {
     if (name == titleAttr) {
       if (LinkStyle* link = GetLinkStyle())
         link->SetSheetTitle(value);
     }
 
@@ skipping 254 matching lines @@
   HTMLElement::Trace(visitor);
   LinkLoaderClient::Trace(visitor);
 }
 
 DEFINE_TRACE_WRAPPERS(HTMLLinkElement) {
   visitor->TraceWrappers(rel_list_);
   HTMLElement::TraceWrappers(visitor);
 }
 
 }  // namespace blink