Extract executeScript-like functionality into a single ExtensionScriptExecutor class.

chrome/browser/extensions/script_executor.h

Index: chrome/browser/extensions/script_executor.h
diff --git a/chrome/browser/extensions/script_executor.h b/chrome/browser/extensions/script_executor.h
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+// 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_H_
+#define CHROME_BROWSER_EXTENSIONS_SCRIPT_EXECUTOR_H_
+#pragma once
+
+#include <string>
+
+#include "base/callback_forward.h"
+#include "chrome/common/extensions/user_script.h"
+
+namespace content {
+class WebContents;
+}
+
+namespace extensions {
+
+// Interface for executing extension content scripts (e.g. executeScript) as
+// described by the ExtensionMsg_ExecuteCode_Params IPC, and notifying the
+// caller when responded with ExtensionHostMsg_ExecuteCodeFinished.
+class ScriptExecutor {
+ public:
+  virtual ~ScriptExecutor() {}
+
+  // The type of script being injected.
+  enum ScriptType {
+    JAVASCRIPT,
+    CSS,
+  };
+
+  // The scope of the script injection across the frames.
+  enum FrameScope {
+    TOP_FRAME,
+    ALL_FRAMES,
+  };
+
+  // The type of world to inject into (main world, or its own isolated world).
+  enum WorldType {
+    MAIN_WORLD,
+    ISOLATED_WORLD,
+  };
+
+  // Callback from ExecuteScript. The arguments are (success, error).
+  typedef base::Callback<void(bool, const std::string&)> ExecuteScriptCallback;
+
+  // Executes a script. The arguments match ExtensionMsg_ExecuteCode_Params in
+  // extension_messages.h (request_id is populated automatically).
+  //
+  // |callback| will always be called even if the IPC'd renderer is destroyed
+  // before a response is received (in this case the callback will be with a
+  // failure and appropriate error message).
+  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) = 0;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_SCRIPT_EXECUTOR_H_