Alter the ActivityLog db table schemas.

chrome/browser/extensions/activity_actions.h

Index: chrome/browser/extensions/activity_actions.h
===================================================================
--- chrome/browser/extensions/activity_actions.h	(revision 182082)
+++ chrome/browser/extensions/activity_actions.h	(working copy)
@@ -18,6 +18,9 @@
 // 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;
 
@@ -31,6 +34,13 @@
   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>;