localStorage: Aggressively flush to disk for Android WebView.

content/browser/dom_storage/dom_storage_area.h

 // Copyright 2013 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_DOM_STORAGE_DOM_STORAGE_AREA_H_
 #define CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_AREA_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 17 matching lines @@
 // backed by storage on disk and lazily commits changes to disk.
 // See class comments for DOMStorageContextImpl for a larger overview.
 class CONTENT_EXPORT DOMStorageArea
     : public base::RefCountedThreadSafe<DOMStorageArea> {
 
  public:
   static const base::FilePath::CharType kDatabaseFileExtension[];
   static base::FilePath DatabaseFileNameFromOrigin(const GURL& origin);
   static GURL OriginFromDatabaseFileName(const base::FilePath& file_name);
 
+  // Commence aggressive flushing. This should be called early in the 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();
+
   // Local storage. Backed on disk if directory is nonempty.
   DOMStorageArea(const GURL& origin,
                  const base::FilePath& directory,
                  DOMStorageTaskRunner* task_runner);
 
   // Session storage. Backed on disk if |session_storage_backing| is not NULL.
   DOMStorageArea(int64 namespace_id,
                  const std::string& persistent_namespace_id,
                  const GURL& origin,
                  SessionStorageDatabase* session_storage_backing,
@@ skipping 97 matching lines @@
   // task sequence when complete.
   CommitBatch* CreateCommitBatchIfNeeded();
   void OnCommitTimer();
   void PostCommitTask();
   void CommitChanges(const CommitBatch* commit_batch);
   void OnCommitComplete();
   base::TimeDelta ComputeCommitDelay() const;
 
   void ShutdownInCommitSequence();
 
+  static bool s_aggressive_flushing_enabled_;
+
   int64 namespace_id_;
   std::string persistent_namespace_id_;
   GURL origin_;
   base::FilePath directory_;
   scoped_refptr<DOMStorageTaskRunner> task_runner_;
   scoped_refptr<DOMStorageMap> map_;
   scoped_ptr<DOMStorageDatabaseAdapter> backing_;
   scoped_refptr<SessionStorageDatabase> session_storage_backing_;
   bool is_initial_import_done_;
   bool is_shutdown_;
   scoped_ptr<CommitBatch> commit_batch_;
   int commit_batches_in_flight_;
   base::TimeTicks start_time_;
   RateLimiter data_rate_limiter_;
   RateLimiter commit_rate_limiter_;
 
   DISALLOW_COPY_AND_ASSIGN(DOMStorageArea);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_AREA_H_