Introduce DeclarativeUserScriptManager.

chrome/browser/extensions/declarative_user_script_manager.h

Index: chrome/browser/extensions/declarative_user_script_manager.h
diff --git a/chrome/browser/extensions/declarative_user_script_manager.h b/chrome/browser/extensions/declarative_user_script_manager.h
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+// Copyright 2014 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_DECLARATIVE_USER_SCRIPT_MANAGER_H_
+#define CHROME_BROWSER_EXTENSIONS_DECLARATIVE_USER_SCRIPT_MANAGER_H_
+
+#include <map>
+
+#include "base/macros.h"
+#include "base/memory/linked_ptr.h"
+
+class Profile;
+
+namespace extensions {
+class DeclarativeUserScriptMaster;
+
+// Manages a set of DeclarativeUserScriptMaster objects for script injections.
+class DeclarativeUserScriptManager {
+ public:
+  explicit DeclarativeUserScriptManager(Profile* profile);
+  ~DeclarativeUserScriptManager();
+
+  // Get the user script master for declarative scripts; if one does not exist,
+  // a new object will be created.
+  DeclarativeUserScriptMaster* GetDeclarativeUserScriptMasterByID(
+      const std::string& id);
+
+ private:
+  using UserScriptMasterMap =
+      std::map<std::string, linked_ptr<DeclarativeUserScriptMaster>>;
+
+  // A map of DeclarativeUserScriptMasters for ids; each master is lazily
+  // initialized.
+  UserScriptMasterMap declarative_user_script_masters_;
+
+  Profile* profile_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeclarativeUserScriptManager);
+};
+
+}  // extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_DECLARATIVE_USER_SCRIPT_MANAGER_H_