Alter the ActivityLog db table schemas.

chrome/browser/extensions/activity_actions.h

 // Copyright (c) 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 CHROME_BROWSER_EXTENSIONS_ACTIVITY_ACTIONS_H_
 #define CHROME_BROWSER_EXTENSIONS_ACTIVITY_ACTIONS_H_
 
 #include <string>
 #include "base/memory/ref_counted_memory.h"
 #include "base/values.h"
 #include "chrome/browser/history/url_database.h"
 #include "sql/connection.h"
 #include "sql/transaction.h"
 
 namespace extensions {
 
 // This is the interface for extension actions that are to be recorded in
 // the activity log.
 class Action : public base::RefCountedThreadSafe<Action> {
  public:
+  // Initialize the table for a given action type.
+  static bool InitializeTableInternal(sql::Connection* db);
+
   // Record the action in the database.
   virtual void Record(sql::Connection* db) = 0;
 
   // Print an action with il8n substitutions for display.
   virtual std::string PrettyPrintFori18n() = 0;
 
   // Print an action as a regular string for debugging purposes.
   virtual std::string PrettyPrintForDebug() = 0;
 
  protected:
   Action() {}
   virtual ~Action() {}
 
+  // Initialize the table for a given action type.
+  static bool InitializeTableInternal(sql::Connection* db,
+                                      const char* table_name,
+                                      const char* basic_fields,
+                                      const char* content_fields[],
+                                      const int num_content_fields);
+
  private:
   friend class base::RefCountedThreadSafe<Action>;
 
   DISALLOW_COPY_AND_ASSIGN(Action);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_ACTIVITY_ACTIONS_H_