Implement <webview>.addContentScript/removeContentScript API [2]

extensions/browser/guest_view/web_view/web_ui/web_ui_url_fetcher_group.h

Index: extensions/browser/guest_view/web_view/web_ui/web_ui_url_fetcher_group.h
diff --git a/extensions/browser/guest_view/web_view/web_ui/web_ui_url_fetcher_group.h b/extensions/browser/guest_view/web_view/web_ui/web_ui_url_fetcher_group.h
new file mode 100644
index 0000000000000000000000000000000000000000..c55b5d3ac8311110dc5553db29c6798fc7ef83f4
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+++ b/extensions/browser/guest_view/web_view/web_ui/web_ui_url_fetcher_group.h
@@ -0,0 +1,57 @@
+// Copyright 2015 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 EXTENSIONS_BROWSER_WEB_UI_URL_FETCHER_GROUP_H
+#define EXTENSIONS_BROWSER_WEB_UI_URL_FETCHER_GROUP_H
+
+#include <set>
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_vector.h"
+#include "extensions/browser/guest_view/web_view/web_ui/web_ui_url_fetcher.h"
+#include "extensions/common/user_script.h"
+
+namespace content {
+class BrowserContext;
+}
+
+// WebUIURLFetcherGroup receives a set of user script file load tasks, and
+// starts a group of async URL fetchs. When all the fetches are done, it runs
+// the callback from the owner of the group.
+class WebUIURLFetcherGroup : public base::RefCounted<WebUIURLFetcherGroup> {
+ public:
+  WebUIURLFetcherGroup(content::BrowserContext* context,
+                       const base::Closure& callback);
+
+  // Starts URL requests to load the contents of several files from the
+  // associated render specified by |render_process_id, render_view_id|.
+  void Start(std::set<extensions::UserScript::File*> file_set,
+             int render_process_id,
+             int render_view_id);
+
+ private:
+  friend class base::RefCounted<WebUIURLFetcherGroup>;
+
+  virtual ~WebUIURLFetcherGroup();
+
+  // Called when each single URL fetch is complete. It also traces the number of
+  // complete fetches. If all the fetches are done, runs the callback function
+  // from the owner of this group.
+  void OnWebUIURLFetchComplete(extensions::UserScript::File* script_file,
+                               bool success,
+                               const std::string& data);
+
+  content::BrowserContext* context_;
+
+  // The number of complete fetchs.
+  size_t complete_fetchers_;
+
+  ScopedVector<WebUIURLFetcher> fetchers_;
+  base::Closure callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebUIURLFetcherGroup);
+};
+
+#endif  // EXTENSIONS_BROWSER_WEB_UI_URL_FETCHER_GROUP_H