Store per-origin metadata for localstorage.

content/browser/leveldb_wrapper_impl.h

 // Copyright 2016 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 CONTENT_BROWSER_LEVELDB_WRAPPER_IMPL_H_
 #define CONTENT_BROWSER_LEVELDB_WRAPPER_IMPL_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 15 matching lines @@
 // features not found directly in leveldb.
 // 1) Adds the given prefix, if any, to all keys. This allows the sharing of one
 //    database across many, possibly untrusted, consumers and ensuring that they
 //    can't access each other's values.
 // 2) Enforces a max_size constraint.
 // 3) Informs observers when values scoped by prefix are modified.
 // 4) Throttles requests to avoid overwhelming the disk.
 class CONTENT_EXPORT LevelDBWrapperImpl : public mojom::LevelDBWrapper {
  public:
   using PrepareToCommitCallback =
-      base::Callback<std::vector<leveldb::mojom::BatchedOperationPtr>()>;
+      base::Callback<std::vector<leveldb::mojom::BatchedOperationPtr>(
+          const LevelDBWrapperImpl&)>;
 
   // |no_bindings_callback| will be called when this object has no more
   // bindings and all pending modifications have been processed.
   LevelDBWrapperImpl(leveldb::mojom::LevelDBDatabase* database,
                      const std::string& prefix,
                      size_t max_size,
                      base::TimeDelta default_commit_delay,
                      int max_bytes_per_hour,
                      int max_commits_per_hour,
                      const base::Closure& no_bindings_callback,
                      const PrepareToCommitCallback& prepare_to_commit_callback);
   ~LevelDBWrapperImpl() override;
 
   void Bind(mojom::LevelDBWrapperRequest request);
 
+  size_t bytes_used() const { return bytes_used_; }
+
   // Commence aggressive flushing. This should be called early during startup,
   // before any localStorage writing. Currently scheduled writes will not be
   // rescheduled and will be flushed at the scheduled time after which
   // aggressive flushing will commence.
   static void EnableAggressiveCommitDelay();
 
  private:
   friend class LevelDBWrapperImplTest;
 
   using ValueMap = std::map<std::vector<uint8_t>, std::vector<uint8_t>>;
@@ skipping 75 matching lines @@
   base::WeakPtrFactory<LevelDBWrapperImpl> weak_ptr_factory_;
 
   static bool s_aggressive_flushing_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(LevelDBWrapperImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LEVELDB_WRAPPER_IMPL_H_