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diff --git a/webkit/api/public/WebApplicationCacheHost.h b/webkit/api/public/WebApplicationCacheHost.h
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+/*
+ * Copyright (C) 2009 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 THE COPYRIGHT
+ * OWNER 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.
+ */
+
+#ifndef WebApplicationCacheHost_h
+#define WebApplicationCacheHost_h
+
+#include "WebCommon.h"
+
+namespace WebKit {
+    class WebApplicationCacheHostClient;
+    class WebURL;
+    class WebURLRequest;
+    class WebURLResponse;
+    struct WebURLError;
+
+    // This interface is used by webkit to call out to the embedder. Webkit uses
+    // the WebKitClient::createApplicationCacheHost method to create instances,
+    // and calls delete when the instance is no longer needed.
+    class WebApplicationCacheHost {
+    public:
+        // These values must match WebCore::ApplicationCacheHost::Status values
+        enum Status {
+            Uncached,
+            Idle,
+            Checking,
+            Downloading,
+            UpdateReady,
+            Obsolete
+        };
+
+        // These values must match WebCore::ApplicationCacheHost::EventID values
+        enum EventID {
+            CheckingEvent,
+            ErrorEvent,
+            NoUpdateEvent,
+            DownloadingEvent,
+            ProgressEvent,
+            UpdateReadyEvent,
+            CachedEvent,
+            ObsoleteEvent
+        };
+
+        virtual ~WebApplicationCacheHost() { }
+
+        // Called for every request made within the context.
+        virtual void willStartMainResourceRequest(WebURLRequest&) = 0;
+        virtual void willStartSubResourceRequest(WebURLRequest&) = 0;
+
+        // One or the other is called after having parsed the <html> tag.
+        virtual void selectCacheWithoutManifest() = 0;
+        virtual void selectCacheWithManifest(const WebURL& manifestURL) = 0;
+
+        // Called as the main resource is retrieved.
+        virtual void didReceiveResponseForMainResource(const WebURLResponse&) = 0;
+        virtual void didReceiveDataForMainResource(const char* data, int len) = 0;
+        virtual void didFinishLoadingMainResource(bool success) = 0;
+
+        // Called on behalf of the scriptable interface.
+        virtual Status status() = 0;
+        virtual bool startUpdate() = 0;
+        virtual bool swapCache() = 0;
+    };
+
+}  // namespace WebKit
+
+#endif  // WebApplicationCacheHost_h
+