Content Verification: Don't access UI-thread objects on the IO thread

extensions/browser/content_verifier_io_data.h

+// 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 EXTENSIONS_BROWSER_CONTENT_VERIFIER_IO_DATA_H_
+#define EXTENSIONS_BROWSER_CONTENT_VERIFIER_IO_DATA_H_
+
+#include <map>
+#include <set>
+#include <string>
+
+#include "base/files/file_path.h"
+#include "base/memory/linked_ptr.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/version.h"
+
+namespace extensions {
+
+// A helper class for keeping track of data for the ContentVerifier that should
+// only be accessed on the IO thread.
+class ContentVerifierIOData
+    : public base::RefCountedThreadSafe<ContentVerifierIOData> {
+ public:
+  struct ExtensionData {
+    std::set<base::FilePath> browser_image_paths;
+    base::Version version;
+
+    ExtensionData(const std::set<base::FilePath>& browser_image_paths,
+                  const base::Version& version);
+    ~ExtensionData();
+  };
+
+  ContentVerifierIOData();
+
+  void AddData(const std::string& extension_id, scoped_ptr<ExtensionData> data);
+  void RemoveData(const std::string& extension_id);
+  void Clear();
+
+  // This should be called on the IO thread, and the return value should not
+  // be retained or used on other threads.
+  const ExtensionData* GetData(const std::string& extension_id);
+
+ protected:
+  friend class base::RefCountedThreadSafe<ContentVerifierIOData>;
+  virtual ~ContentVerifierIOData();
+
+  std::map<std::string, linked_ptr<ExtensionData> > data_map_;
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_CONTENT_VERIFIER_IO_DATA_H_