Save extension activity log to a file.

chrome/browser/extensions/activity_actions.h

Index: chrome/browser/extensions/activity_actions.h
===================================================================
--- chrome/browser/extensions/activity_actions.h	(revision 0)
+++ chrome/browser/extensions/activity_actions.h	(revision 0)
@@ -0,0 +1,34 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// User 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"
+
+namespace extensions {
+
+// This is the interface for extension actions that are to be recorded in
+// the activity log.
+class Action {
+ public:
+  // 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() {}
+
+  DISALLOW_COPY_AND_ASSIGN(Action);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_ACTIVITY_ACTIONS_H_
+