Add Data Saver support to Cronet

components/cronet/android/cronet_in_memory_pref_store.h

-// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Copyright 2015 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 ANDROID_WEBVIEW_BROWSER_AW_PREF_STORE_H_
-#define ANDROID_WEBVIEW_BROWSER_AW_PREF_STORE_H_
+#ifndef COMPONENTS_CRONET_ANDROID_CRONET_IN_MEMORY_PREF_STORE_H_
+#define COMPONENTS_CRONET_ANDROID_CRONET_IN_MEMORY_PREF_STORE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/observer_list.h"
 #include "base/prefs/persistent_pref_store.h"
 #include "base/prefs/pref_value_map.h"
 
+namespace base {
+class Value;
+}
+
 // A light-weight prefstore implementation that keeps preferences
-// in a memory backed store. This is not a persistent prefstore -- we
-// subclass the PersistentPrefStore here since it is needed by the
-// PrefService, which in turn is needed by the Autofill component.
-class AwPrefStore : public PersistentPrefStore {
+// in a memory backed store. This is not a persistent prefstore.
+// TODO(bengr): Move to base/prefs or some other shared location.
+class CronetInMemoryPrefStore : public PersistentPrefStore {
  public:
-  AwPrefStore();
+  CronetInMemoryPrefStore();
 
-  // Overriden from PrefStore.
+  // Overrides from PrefStore:
   bool GetValue(const std::string& key,
                 const base::Value** result) const override;
   void AddObserver(PrefStore::Observer* observer) override;
   void RemoveObserver(PrefStore::Observer* observer) override;
   bool HasObservers() const override;
   bool IsInitializationComplete() const override;
 
   // PersistentPrefStore overrides:
   bool GetMutableValue(const std::string& key, base::Value** result) override;
   void ReportValueChanged(const std::string& key) override;
   void SetValue(const std::string& key, base::Value* value) override;
   void SetValueSilently(const std::string& key, base::Value* value) override;
   void RemoveValue(const std::string& key) override;
   bool ReadOnly() const override;
   PrefReadError GetReadError() const override;
   PersistentPrefStore::PrefReadError ReadPrefs() override;
   void ReadPrefsAsync(ReadErrorDelegate* error_delegate) override;
   void CommitPendingWrite() override {}
 
- protected:
-  ~AwPrefStore() override;
+ private:
+  ~CronetInMemoryPrefStore() override;
 
- private:
   // Stores the preference values.
   PrefValueMap prefs_;
 
   ObserverList<PrefStore::Observer, true> observers_;
 
-  DISALLOW_COPY_AND_ASSIGN(AwPrefStore);
+  DISALLOW_COPY_AND_ASSIGN(CronetInMemoryPrefStore);
 };
 
-#endif  // ANDROID_WEBVIEW_BROWSER_AW_PREF_STORE_H_
+#endif  // COMPONENTS_CRONET_ANDROID_CRONET_IN_MEMORY_PREF_STORE_H_