[tracing] Show the local storage databases under dom_storage

content/browser/dom_storage/dom_storage_database.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_DATABASE_H_
 #define CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_DATABASE_H_
 
 #include <map>
 #include <memory>
+#include <string>
 
 #include "base/files/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/strings/nullable_string16.h"
 #include "base/strings/string16.h"
 #include "content/common/content_export.h"
 #include "content/common/dom_storage/dom_storage_types.h"
 #include "sql/connection.h"
 
+namespace base {
+namespace trace_event {
+class ProcessMemoryDump;
+}
+}
+
 namespace content {
 
 // Represents a SQLite based backing for DOM storage data. This
 // class is designed to be used on a single thread.
 class CONTENT_EXPORT DOMStorageDatabase {
  public:
   static base::FilePath GetJournalFilePath(const base::FilePath& database_path);
 
   explicit DOMStorageDatabase(const base::FilePath& file_path);
   virtual ~DOMStorageDatabase();  // virtual for unit testing
 
   // Reads all the key, value pairs stored in the database and returns
   // them. |result| is assumed to be empty and any duplicate keys will
   // be overwritten. If the database exists on disk then it will be
   // opened. If it does not exist then it will not be created and
   // |result| will be unmodified.
   void ReadAllValues(DOMStorageValuesMap* result);
 
   // Updates the backing database. Will remove all keys before updating
   // the database if |clear_all_first| is set. Then all entries in
   // |changes| will be examined - keys mapped to a null NullableString16
   // will be removed and all others will be inserted/updated as appropriate.
   bool CommitChanges(bool clear_all_first, const DOMStorageValuesMap& changes);
 
+  // Adds memory statistics of the database to |pmd| for tracing.
+  void ReportMemoryUsage(base::trace_event::ProcessMemoryDump* pmd,
+                         const std::string& name);
+
   // Simple getter for the path we were constructed with.
   const base::FilePath& file_path() const { return file_path_; }
 
  protected:
   // Constructor that uses an in-memory sqlite database, for testing.
   DOMStorageDatabase();
 
  private:
   friend class LocalStorageDatabaseAdapter;
   FRIEND_TEST_ALL_PREFIXES(DOMStorageDatabaseTest, SimpleOpenAndClose);
@@ skipping 57 matching lines @@
   const base::FilePath file_path_;
   std::unique_ptr<sql::Connection> db_;
   bool failed_to_open_;
   bool tried_to_recreate_;
   bool known_to_be_empty_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_DATABASE_H_