Introduce DeclarativeUserScriptManager.

chrome/browser/extensions/declarative_user_script_manager.cc

+// 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.
+
+#include "chrome/browser/extensions/declarative_user_script_manager.h"
+
+#include "chrome/browser/extensions/declarative_user_script_master.h"
+#include "content/public/browser/browser_context.h"
+
+namespace extensions {
+
+DeclarativeUserScriptManager::DeclarativeUserScriptManager(Profile* profile)
+  : profile_(profile) {
+}
+
+DeclarativeUserScriptManager::~DeclarativeUserScriptManager() {
+}
+
+DeclarativeUserScriptMaster*
+DeclarativeUserScriptManager::GetDeclarativeUserScriptMasterByID(
+    const ExtensionId& extension_id) {
+  DeclarativeUserScriptMaster* master = NULL;
+  for (ScopedVector<DeclarativeUserScriptMaster>::iterator it =

[Fady Samuel, 2014/12/11 19:58:27]

Why not use a map?

+           declarative_user_script_masters_.begin();
+       it != declarative_user_script_masters_.end();
+       ++it) {
+    if ((*it)->extension_id() == extension_id) {
+      master = *it;
+      break;
+    }
+  }
+  if (!master) {
+    master = new DeclarativeUserScriptMaster(profile_, extension_id);
+    declarative_user_script_masters_.push_back(master);
+  }
+  return master;
+}
+
+}  // extensions