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diff --git a/WebCore/loader/appcache/ApplicationCacheHost.cpp b/WebCore/loader/appcache/ApplicationCacheHost.cpp
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+++ b/WebCore/loader/appcache/ApplicationCacheHost.cpp
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+/*
+ * Copyright (C) 2008, 2009 Apple Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "ApplicationCacheHost.h"
+
+#if ENABLE(OFFLINE_WEB_APPLICATIONS)
+
+#include "ApplicationCache.h"
+#include "ApplicationCacheGroup.h"
+#include "ApplicationCacheResource.h"
+#include "DocumentLoader.h"
+#include "DOMApplicationCache.h"
+#include "Frame.h"
+#include "FrameLoader.h"
+#include "FrameLoaderClient.h"
+#include "MainResourceLoader.h"
+#include "ResourceLoader.h"
+#include "ResourceRequest.h"
+#include "Settings.h"
+
+namespace WebCore {
+
+ApplicationCacheHost::ApplicationCacheHost(DocumentLoader* documentLoader)
+    : m_domApplicationCache(0)
+    , m_documentLoader(documentLoader)
+    , m_candidateApplicationCacheGroup(0)
+{
+    ASSERT(m_documentLoader);
+}
+
+ApplicationCacheHost::~ApplicationCacheHost()
+{
+    if (m_applicationCache)
+        m_applicationCache->group()->disassociateDocumentLoader(m_documentLoader);
+    else if (m_candidateApplicationCacheGroup)
+        m_candidateApplicationCacheGroup->disassociateDocumentLoader(m_documentLoader);
+}
+
+void ApplicationCacheHost::selectCacheWithoutManifest()
+{
+    ApplicationCacheGroup::selectCacheWithoutManifestURL(m_documentLoader->frame());
+}
+
+void ApplicationCacheHost::selectCacheWithManifest(const KURL& manifestURL)
+{
+    ApplicationCacheGroup::selectCache(m_documentLoader->frame(), manifestURL);
+}
+
+void ApplicationCacheHost::maybeLoadMainResource(ResourceRequest& request, SubstituteData& substituteData)
+{
+    // Check if this request should be loaded from the application cache
+    if (!substituteData.isValid() && isApplicationCacheEnabled()) {
+        ASSERT(!m_mainResourceApplicationCache);
+
+        m_mainResourceApplicationCache = ApplicationCacheGroup::cacheForMainRequest(request, m_documentLoader);
+
+        if (m_mainResourceApplicationCache) {
+            // Get the resource from the application cache. By definition, cacheForMainRequest() returns a cache that contains the resource.
+            ApplicationCacheResource* resource = m_mainResourceApplicationCache->resourceForRequest(request);
+            substituteData = SubstituteData(resource->data(), 
+                                            resource->response().mimeType(),
+                                            resource->response().textEncodingName(), KURL());
+        }
+    }
+}
+
+bool ApplicationCacheHost::maybeLoadFallbackForMainResponse(const ResourceRequest& request, const ResourceResponse& r)
+{
+    if (r.httpStatusCode() / 100 == 4 || r.httpStatusCode() / 100 == 5) {
+        ASSERT(!m_mainResourceApplicationCache);
+        if (isApplicationCacheEnabled()) {
+            m_mainResourceApplicationCache = ApplicationCacheGroup::fallbackCacheForMainRequest(request, documentLoader());
+
+            if (scheduleLoadFallbackResourceFromApplicationCache(documentLoader()->mainResourceLoader(), m_mainResourceApplicationCache.get()))
+                return true;
+        }
+    }
+    return false;
+}
+
+bool ApplicationCacheHost::maybeLoadFallbackForMainError(const ResourceRequest& request, const ResourceError& error)
+{
+    if (!error.isCancellation()) {
+        ASSERT(!m_mainResourceApplicationCache);
+        if (isApplicationCacheEnabled()) {
+            m_mainResourceApplicationCache = ApplicationCacheGroup::fallbackCacheForMainRequest(request, m_documentLoader);
+
+            if (scheduleLoadFallbackResourceFromApplicationCache(documentLoader()->mainResourceLoader(), m_mainResourceApplicationCache.get()))
+                return true;
+        }
+    }
+    return false;
+}
+
+void ApplicationCacheHost::mainResourceDataReceived(const char*, int, long long, bool)
+{
+    // This method is here to facilitate alternate implemetations of this interface by the host browser.
+}
+
+void ApplicationCacheHost::failedLoadingMainResource()
+{
+    ApplicationCacheGroup* group = m_candidateApplicationCacheGroup;
+    if (!group && m_applicationCache) {
+        ASSERT(!mainResourceApplicationCache()); // If the main resource were loaded from a cache, it wouldn't fail.
+        group = m_applicationCache->group();
+    }
+    
+    if (group)
+        group->failedLoadingMainResource(m_documentLoader);
+}
+
+void ApplicationCacheHost::finishedLoadingMainResource()
+{
+    ApplicationCacheGroup* group = candidateApplicationCacheGroup();
+    if (!group && applicationCache() && !mainResourceApplicationCache())
+        group = applicationCache()->group();
+    
+    if (group)
+        group->finishedLoadingMainResource(m_documentLoader);
+}
+
+bool ApplicationCacheHost::maybeLoadResource(ResourceLoader* loader, ResourceRequest& request, const KURL& originalURL)
+{
+    if (!isApplicationCacheEnabled())
+        return false;
+    
+    if (request.url() != originalURL)
+        return false;
+
+    ApplicationCacheResource* resource;
+    if (!shouldLoadResourceFromApplicationCache(request, resource))
+        return false;
+    
+    m_documentLoader->m_pendingSubstituteResources.set(loader, resource);
+    m_documentLoader->deliverSubstituteResourcesAfterDelay();
+        
+    return true;
+}
+
+bool ApplicationCacheHost::maybeLoadFallbackForRedirect(ResourceLoader* resourceLoader, ResourceRequest& request, const ResourceResponse& redirectResponse)
+{
+    if (!redirectResponse.isNull() && !protocolHostAndPortAreEqual(request.url(), redirectResponse.url()))
+        if (scheduleLoadFallbackResourceFromApplicationCache(resourceLoader))
+            return true;
+    return false;
+}
+
+bool ApplicationCacheHost::maybeLoadFallbackForResponse(ResourceLoader* resourceLoader, const ResourceResponse& response)
+{
+    if (response.httpStatusCode() / 100 == 4 || response.httpStatusCode() / 100 == 5)
+        if (scheduleLoadFallbackResourceFromApplicationCache(resourceLoader))
+            return true;
+    return false;
+}
+
+bool ApplicationCacheHost::maybeLoadFallbackForError(ResourceLoader* resourceLoader, const ResourceError& error)
+{
+    if (!error.isCancellation())
+        if (scheduleLoadFallbackResourceFromApplicationCache(resourceLoader))
+            return true;
+    return false;
+}
+
+bool ApplicationCacheHost::maybeLoadSynchronously(ResourceRequest& request, ResourceError& error, ResourceResponse& response, Vector<char>& data)
+{
+    ApplicationCacheResource* resource;
+    if (shouldLoadResourceFromApplicationCache(request, resource)) {
+        if (resource) {
+            response = resource->response();
+            data.append(resource->data()->data(), resource->data()->size());
+        } else {
+            error = documentLoader()->frameLoader()->client()->cannotShowURLError(request);
+        }
+        return true;
+    }
+    return false;
+}
+
+void ApplicationCacheHost::maybeLoadFallbackSynchronously(const ResourceRequest& request, ResourceError& error, ResourceResponse& response, Vector<char>& data)
+{
+    // If normal loading results in a redirect to a resource with another origin (indicative of a captive portal), or a 4xx or 5xx status code or equivalent,
+    // or if there were network errors (but not if the user canceled the download), then instead get, from the cache, the resource of the fallback entry
+    // corresponding to the matched namespace.
+    if ((!error.isNull() && !error.isCancellation())
+         || response.httpStatusCode() / 100 == 4 || response.httpStatusCode() / 100 == 5
+         || !protocolHostAndPortAreEqual(request.url(), response.url())) {
+        ApplicationCacheResource* resource;
+        if (getApplicationCacheFallbackResource(request, resource)) {
+            response = resource->response();
+            data.clear();
+            data.append(resource->data()->data(), resource->data()->size());
+        }
+    }
+}
+
+bool ApplicationCacheHost::canCacheInPageCache() const 
+{
+    return !applicationCache() && !candidateApplicationCacheGroup();
+}
+
+void ApplicationCacheHost::setDOMApplicationCache(DOMApplicationCache* domApplicationCache)
+{
+    ASSERT(!m_domApplicationCache || !domApplicationCache);
+    m_domApplicationCache = domApplicationCache;
+}
+
+void ApplicationCacheHost::notifyEventListener(EventID id)
+{
+    if (m_domApplicationCache)
+        m_domApplicationCache->callEventListener(id);
+}
+
+void ApplicationCacheHost::setCandidateApplicationCacheGroup(ApplicationCacheGroup* group)
+{
+    ASSERT(!m_applicationCache);
+    m_candidateApplicationCacheGroup = group;
+}
+    
+void ApplicationCacheHost::setApplicationCache(PassRefPtr<ApplicationCache> applicationCache)
+{
+    if (m_candidateApplicationCacheGroup) {
+        ASSERT(!m_applicationCache);
+        m_candidateApplicationCacheGroup = 0;
+    }
+
+    m_applicationCache = applicationCache;
+}
+
+bool ApplicationCacheHost::shouldLoadResourceFromApplicationCache(const ResourceRequest& request, ApplicationCacheResource*& resource)
+{
+    ApplicationCache* cache = applicationCache();
+    if (!cache || !cache->isComplete())
+        return false;
+
+    // If the resource is not a HTTP/HTTPS GET, then abort
+    if (!ApplicationCache::requestIsHTTPOrHTTPSGet(request))
+        return false;
+
+    // If the resource's URL is an master entry, the manifest, an explicit entry, or a fallback entry
+    // in the application cache, then get the resource from the cache (instead of fetching it).
+    resource = cache->resourceForURL(request.url());
+
+    // Resources that match fallback namespaces or online whitelist entries are fetched from the network,
+    // unless they are also cached.
+    if (!resource && (cache->urlMatchesFallbackNamespace(request.url()) || cache->isURLInOnlineWhitelist(request.url())))
+        return false;
+
+    // Resources that are not present in the manifest will always fail to load (at least, after the
+    // cache has been primed the first time), making the testing of offline applications simpler.
+    return true;
+}
+
+bool ApplicationCacheHost::getApplicationCacheFallbackResource(const ResourceRequest& request, ApplicationCacheResource*& resource, ApplicationCache* cache)
+{
+    if (!cache) {
+        cache = applicationCache();
+        if (!cache)
+            return false;
+    }
+    if (!cache->isComplete())
+        return false;
+    
+    // If the resource is not a HTTP/HTTPS GET, then abort
+    if (!ApplicationCache::requestIsHTTPOrHTTPSGet(request))
+        return false;
+
+    KURL fallbackURL;
+    if (!cache->urlMatchesFallbackNamespace(request.url(), &fallbackURL))
+        return false;
+
+    resource = cache->resourceForURL(fallbackURL);
+    ASSERT(resource);
+
+    return true;
+}
+
+bool ApplicationCacheHost::scheduleLoadFallbackResourceFromApplicationCache(ResourceLoader* loader, ApplicationCache* cache)
+{
+    if (!isApplicationCacheEnabled())
+        return false;
+
+    ApplicationCacheResource* resource;
+    if (!getApplicationCacheFallbackResource(loader->request(), resource, cache))
+        return false;
+
+    m_documentLoader->m_pendingSubstituteResources.set(loader, resource);
+    m_documentLoader->deliverSubstituteResourcesAfterDelay();
+    
+    loader->handle()->cancel();
+
+    return true;
+}
+
+ApplicationCacheHost::Status ApplicationCacheHost::status() const
+{
+    ApplicationCache* cache = applicationCache();    
+    if (!cache)
+        return UNCACHED;
+
+    switch (cache->group()->updateStatus()) {
+        case ApplicationCacheGroup::Checking:
+            return CHECKING;
+        case ApplicationCacheGroup::Downloading:
+            return DOWNLOADING;
+        case ApplicationCacheGroup::Idle: {
+            if (cache->group()->isObsolete())
+                return OBSOLETE;
+            if (cache != cache->group()->newestCache())
+                return UPDATEREADY;
+            return IDLE;
+        }
+    }
+
+    ASSERT_NOT_REACHED();
+    return UNCACHED;
+}
+
+bool ApplicationCacheHost::update()
+{
+    ApplicationCache* cache = applicationCache();
+    if (!cache)
+        return false;
+    cache->group()->update(m_documentLoader->frame(), ApplicationCacheUpdateWithoutBrowsingContext);
+    return true;
+}
+
+bool ApplicationCacheHost::swapCache()
+{
+    ApplicationCache* cache = applicationCache();
+    if (!cache)
+        return false;
+
+    // If the group of application caches to which cache belongs has the lifecycle status obsolete, unassociate document from cache.
+    if (cache->group()->isObsolete()) {
+        cache->group()->disassociateDocumentLoader(m_documentLoader);
+        return true;
+    }
+
+    // If there is no newer cache, raise an INVALID_STATE_ERR exception.
+    ApplicationCache* newestCache = cache->group()->newestCache();
+    if (cache == newestCache)
+        return false;
+    
+    ASSERT(cache->group() == newestCache->group());
+    setApplicationCache(newestCache);
+    
+    return true;
+}
+
+bool ApplicationCacheHost::isApplicationCacheEnabled()
+{
+    return m_documentLoader->frame()->settings()
+           && m_documentLoader->frame()->settings()->offlineWebApplicationCacheEnabled();
+}
+
+}  // namespace WebCore
+
+#endif  // ENABLE(OFFLINE_WEB_APPLICATIONS)