Extract executeScript-like functionality into a single ExtensionScriptExecutor class.

chrome/browser/extensions/script_executor_impl.h

+// Copyright (c) 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 CHROME_BROWSER_EXTENSIONS_SCRIPT_EXECUTOR_IMPL_H_
+#define CHROME_BROWSER_EXTENSIONS_SCRIPT_EXECUTOR_IMPL_H_
+#pragma once
+
+#include "chrome/browser/extensions/script_executor.h"
+
+#include "base/compiler_specific.h"
+
+namespace extensions {
+
+// Standard implementation of ScriptExecutor which just sends an IPC to
+// |web_contents_| to execute the script.
+class ScriptExecutorImpl : public ScriptExecutor {
+ public:
+  explicit ScriptExecutorImpl(content::WebContents* web_contents);
+
+  virtual ~ScriptExecutorImpl();
+
+  virtual void ExecuteScript(const std::string& extension_id,
+                             ScriptType script_type,
+                             const std::string& code,
+                             FrameScope frame_scope,
+                             UserScript::RunLocation run_at,
+                             WorldType world_type,
+                             const ExecuteScriptCallback& callback) OVERRIDE;
+ private:
+  // The next value to use for request_id inExtensionMsg_ExecuteCode_Params.
+  int next_request_id_;
+
+  // The WebContents this is bound to.
+  content::WebContents* web_contents_;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_SCRIPT_EXECUTOR_IMPL_H_