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

third_party/WebKit/Source/core/loader/LinkPreloadResourceClients.h

+// Copyright 2017 The Chromium Authors. All rights reserved.

[sof, 2016/01/20 13:22:41]

off by one :)

[Yoav Weiss, 2016/01/20 13:28:05]

thinking ahead :)

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef LinkPreloadResourceClients_h
+#define LinkPreloadResourceClients_h
+
+#include "core/fetch/CSSStyleSheetResource.h"
+#include "core/fetch/FontResource.h"
+#include "core/fetch/ImageResourceClient.h"
+#include "core/fetch/ResourceOwner.h"
+#include "core/fetch/ScriptResource.h"
+#include "core/fetch/StyleSheetResourceClient.h"
+
+namespace blink {
+
+class LinkLoader;
+
+class LinkPreloadResourceClient : public NoBaseWillBeGarbageCollectedFinalized<LinkPreloadResourceClient> {
+public:
+    virtual ~LinkPreloadResourceClient() { }
+
+    void triggerEvents(const Resource*) const;

[sof, 2016/01/20 13:16:15]

(odd-looking const method)

[Yoav Weiss, 2016/01/20 13:28:05]

removed the const part as it's not necessary.

+
+    DEFINE_INLINE_VIRTUAL_TRACE()
+    {
+        visitor->trace(m_loader);
+    }
+
+protected:
+    LinkPreloadResourceClient(LinkLoader* loader)
+        : m_loader(loader)
+    {
+        ASSERT(loader);
+    }
+
+private:
+    RawPtrWillBeMember<LinkLoader> m_loader;
+};
+
+class LinkPreloadScriptResourceClient: public ResourceOwner<ScriptResource, ScriptResourceClient>, public LinkPreloadResourceClient {

[sof, 2016/01/20 13:16:15]

LinkPreloadResourceClient needs to be the leftmost (GC) base, so switch them
around.

[Yoav Weiss, 2016/01/20 13:28:05]

switched order

+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(LinkPreloadScriptResourceClient);
+public:
+    static PassOwnPtrWillBeRawPtr<LinkPreloadScriptResourceClient> create(LinkLoader* loader, ScriptResource* resource)
+    {
+        return adoptPtrWillBeNoop(new LinkPreloadScriptResourceClient(loader, resource));
+    }
+
+    virtual String debugName() const { return "LinkPreloadScript"; }
+
+    void notifyFinished(Resource* resource) override
+    {
+        ASSERT(this->resource() == resource);
+        triggerEvents(resource);
+    }
+
+    DEFINE_INLINE_VIRTUAL_TRACE()
+    {
+        LinkPreloadResourceClient::trace(visitor);
+        ResourceOwner<ScriptResource, ScriptResourceClient>::trace(visitor);
+    }
+
+private:
+    LinkPreloadScriptResourceClient(LinkLoader* loader, ScriptResource* resource)
+        : LinkPreloadResourceClient(loader)
+    {
+        setResource(resource);
+    }
+};
+
+class LinkPreloadStyleResourceClient: public ResourceOwner<CSSStyleSheetResource, StyleSheetResourceClient>, public LinkPreloadResourceClient {

[sof, 2016/01/20 13:16:15]

ditto

[Yoav Weiss, 2016/01/20 13:28:05]

switched order

+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(LinkPreloadStyleResourceClient);
+public:
+    static PassOwnPtrWillBeRawPtr<LinkPreloadStyleResourceClient> create(LinkLoader* loader, CSSStyleSheetResource* resource)
+    {
+        return adoptPtrWillBeNoop(new LinkPreloadStyleResourceClient(loader, resource));
+    }
+
+    virtual String debugName() const { return "LinkPreloadStyle"; }
+
+    void setCSSStyleSheet(const String&, const KURL&, const String&, const CSSStyleSheetResource* resource) override
+    {
+        ASSERT(this->resource() == resource);
+        triggerEvents(static_cast<const Resource*>(resource));
+    }
+
+    DEFINE_INLINE_VIRTUAL_TRACE()
+    {
+        LinkPreloadResourceClient::trace(visitor);
+        ResourceOwner<CSSStyleSheetResource, StyleSheetResourceClient>::trace(visitor);
+    }
+
+private:
+    LinkPreloadStyleResourceClient(LinkLoader* loader, CSSStyleSheetResource* resource)
+        : LinkPreloadResourceClient(loader)
+    {
+        setResource(resource);
+    }
+};
+
+}
+
+#endif // LinkPreloadResourceClients_h