Implement QuotaTemporaryStorageEvictor.

webkit/quota/quota_temporary_storage_evictor.h

Index: webkit/quota/quota_temporary_storage_evictor.h
diff --git a/webkit/quota/quota_temporary_storage_evictor.h b/webkit/quota/quota_temporary_storage_evictor.h
new file mode 100644
index 0000000000000000000000000000000000000000..2313454bbd236b29c184dfbc0bdf67dbdfac7a21
--- /dev/null
+++ b/webkit/quota/quota_temporary_storage_evictor.h
@@ -0,0 +1,70 @@
+// Copyright (c) 2011 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 WEBKIT_QUOTA_QUOTA_TEMPORARY_STORAGE_EVICTOR_H_
+#define WEBKIT_QUOTA_QUOTA_TEMPORARY_STORAGE_EVICTOR_H_
+#pragma once
+
+#include "base/message_loop_proxy.h"
+#include "base/memory/scoped_callback_factory.h"
+#include "base/timer.h"
+#include "webkit/quota/quota_manager.h"
+#include "webkit/quota/quota_types.h"
+
+class GURL;
+
+namespace quota {
+
+class QuotaTemporaryStorageEvictor {
+ public:
+  QuotaTemporaryStorageEvictor(
+      QuotaEvictionHandler* quota_eviction_handler,
+      int64 target_available_space,
+      int64 delay_ms,
+      scoped_refptr<base::MessageLoopProxy> io_thread);
+  virtual ~QuotaTemporaryStorageEvictor();
+
+  void Start();
+
+  void OnQuotaManagerDestroyedOnIOThread();
+
+  bool repeated_eviction() const { return repeated_eviction_; }
+  void set_repeated_eviction(bool repeated_eviction) {
+    repeated_eviction_ = repeated_eviction;
+  }
+
+  static const double kUsageRatioToBeEvicted;
+  const int64 physical_available_space_to_be_evicted;
+
+ private:
+  friend struct QuotaTemporaryStorageEvictorDeleter;
+  friend class QuotaTemporaryStorageEvictorTest;
+
+  void MayStartEviction(int delay_ms);
+  void GetUsageAndQuotaThenEvict();
+  void EvictIfRequired(
+      QuotaStatusCode status,
+      int64 usage,
+      int64 quota,
+      int64 physical_available_space);
+  void DoEvict(const GURL& origin);
+  void OnEvictionCompleted(QuotaStatusCode status);
+
+  QuotaEvictionHandler* quota_eviction_handler_;
+
+  int64 target_available_space_;
+  int64 delay_ms_;
+  bool repeated_eviction_;
+  scoped_refptr<base::MessageLoopProxy> io_thread_;
+
+  base::OneShotTimer<QuotaTemporaryStorageEvictor> timer_;
+
+  base::ScopedCallbackFactory<QuotaTemporaryStorageEvictor> callback_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(QuotaTemporaryStorageEvictor);
+};
+
+}  // namespace quota
+
+#endif  // WEBKIT_QUOTA_QUOTA_TEMPORARY_STORAGE_EVICTOR_H_