Add a copy or move validator to that can handle support audio and video files.

chrome/browser/media_galleries/fileapi/supported_audio_video_checker.h

+// Copyright 2013 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_MEDIA_GALLERIES_FILEAPI_SUPPORTED_AUDIO_VIDEO_CHECKER_H_
+#define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SUPPORTED_AUDIO_VIDEO_CHECKER_H_
+
+#include "base/basictypes.h"
+#include "base/files/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "base/platform_file.h"
+#include "chrome/browser/media_galleries/fileapi/av_scanning_file_validator.h"
+
+class SafeAudioVideoChecker;
+
+namespace chrome {
+class MediaFileValidatorFactory;
+}
+
+// Uses SafeAudioVideoChecker to validate supported audio and video files in
+// the utility process and then uses AVScanningFileValidator to ask the OS to
+// virus scan them. The entire file is not decoded so a positive result from
+// this class does not make the file safe to use in the browser process.
+class SupportedAudioVideoChecker : public chrome::AVScanningFileValidator {
+ public:
+  virtual ~SupportedAudioVideoChecker();
+
+  static bool SupportsFileType(const base::FilePath& path);
+
+  virtual void StartPreWriteValidation(
+      const ResultCallback& result_callback) OVERRIDE;
+
+ private:
+  friend class chrome::MediaFileValidatorFactory;
+
+  explicit SupportedAudioVideoChecker(const base::FilePath& file);
+
+  void OnFileOpen(const base::PlatformFile& file);
+
+  base::FilePath path_;
+  fileapi::CopyOrMoveFileValidator::ResultCallback callback_;
+  scoped_refptr<SafeAudioVideoChecker> safe_checker_;
+  base::WeakPtrFactory<SupportedAudioVideoChecker> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(SupportedAudioVideoChecker);
+};
+
+#endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SUPPORTED_AUDIO_VIDEO_CHECKER_H_