Increase page size for SyncData DB from 4K to maximum supported 32K

sync/syncable/directory_backing_store.h

 // Copyright 2012 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 SYNC_SYNCABLE_DIRECTORY_BACKING_STORE_H_
 #define SYNC_SYNCABLE_DIRECTORY_BACKING_STORE_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 26 matching lines @@
 // The DirectoryBackingStore will own an sqlite lock on its database for most of
 // its lifetime.  You must not have two DirectoryBackingStore objects accessing
 // the database simultaneously.  Because the lock exists at the database level,
 // not even two separate browser instances would be able to acquire it
 // simultaneously.
 //
 // This class is abstract so that we can extend it in interesting ways for use
 // in tests.  The concrete class used in non-test scenarios is
 // OnDiskDirectoryBackingStore.
 class SYNC_EXPORT_PRIVATE DirectoryBackingStore : public base::NonThreadSafe {
+  friend class DirectoryBackingStoreTest;
+  FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest,
+                           IncreaseDatabasePageSizeFrom4KTo32K);
+
  public:
   explicit DirectoryBackingStore(const std::string& dir_name);
   virtual ~DirectoryBackingStore();
 
   // Loads and drops all currently persisted meta entries into |handles_map|
   // and loads appropriate persisted kernel info into |kernel_load_info|.
   // The function determines which entries can be safely dropped and inserts
   // their keys into |metahandles_to_purge|. It is up to the caller to
   // perform the actual cleanup.
   //
@@ skipping 81 matching lines @@
 
   // Checks that the references between sync nodes is consistent.
   static bool VerifyReferenceIntegrity(
       const Directory::MetahandlesMap* handles_map);
 
   // Migration utilities.
   bool RefreshColumns();
   bool SetVersion(int version);
   int GetVersion();
 
+  bool GetDatabasePageSize(int* page_size);
+  bool IsSyncBackingDatabase32KEnabled();
+  bool IncreasePageSizeTo32K();
+  bool Vacuum();
+  int databasePageSize_;
+
   bool MigrateToSpecifics(const char* old_columns,
                           const char* specifics_column,
                           void(*handler_function) (
                               sql::Statement* old_value_query,
                               int old_value_column,
                               sync_pb::EntitySpecifics* mutable_new_value));
 
   // Individual version migrations.
   bool MigrateVersion67To68();
   bool MigrateVersion68To69();
@@ skipping 32 matching lines @@
   void PrepareSaveEntryStatement(EntryTable table,
                                  sql::Statement* save_statement);
 
   DISALLOW_COPY_AND_ASSIGN(DirectoryBackingStore);
 };
 
 }  // namespace syncable
 }  // namespace syncer
 
 #endif  // SYNC_SYNCABLE_DIRECTORY_BACKING_STORE_H_