Restructure SDCH layering to allow more separation (observer/1->[0,n]

chrome/browser/net/chrome_sdch_policy.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_NET_CHROME_SDCH_POLICY_H_
+#define CHROME_BROWSER_NET_CHROME_SDCH_POLICY_H_
+
+#include <string>
+
+#include "net/base/sdch_observer.h"
+#include "net/url_request/sdch_dictionary_fetcher.h"
+
+class GURL;
+
+namespace net {
+class SdchManager;
+class URLRequestContext;
+}
+
+// Implementation of chrome embedder policy for SDCH.  Handles fetches.
+// TODO(rdsmith): Implement dictionary prioritization.
+class ChromeSdchPolicy : public net::SdchObserver {
+ public:
+  // Consumer must guarantee that |sdch_manager| and |context| outlive
+  // this object.
+  ChromeSdchPolicy(net::SdchManager* sdch_manager,
+                   net::URLRequestContext* context);
+  ~ChromeSdchPolicy() override;
+
+  void OnDictionaryFetched(const std::string& dictionary_text,
+                           const GURL& dictionary_url);
+
+  // SdchObserver implementation.
+  void OnGetDictionary(net::SdchManager* manager,
+                       const GURL& request_url,
+                       const GURL& dictionary_url) override;
+  void OnClearDictionaries(net::SdchManager* manager) override;
+
+ private:
+  net::SdchManager* manager_;
+  net::SdchDictionaryFetcher fetcher_;
+};
+
+#endif  // CHROME_BROWSER_NET_CHROME_SDCH_POLICY_H_