mediaview: Recognize more MIME types.

chrome/browser/chromeos/arc/fileapi/arc_documents_provider_util.h

 // Copyright 2016 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.
 //
 // Utilities for ARC documents provider file system.
 
 #ifndef CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_UTIL_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_UTIL_H_
 
 #include <string>
+#include <vector>
 
 #include "base/files/file_path.h"
 
 class GURL;
 
 namespace storage {
 class FileSystemURL;
 }  // namespace storage
 
 namespace arc {
@@ skipping 33 matching lines @@
 // On success, true is returned. All arguments must not be nullptr.
 bool ParseDocumentsProviderUrl(const storage::FileSystemURL& url,
                                std::string* authority,
                                std::string* root_document_id,
                                base::FilePath* path);
 
 // C++ implementation of DocumentsContract.buildDocumentUri() in Android.
 GURL BuildDocumentUrl(const std::string& authority,
                       const std::string& document_id);
 
+// Similar to net::GetExtensionsForMimeType(), but this covers more MIME types
+// used in Android.
+// Returns an empty vector if the MIME type is not known.
+// If the returned vector is not empty, the first extension is the preferred
+// extension.
+std::vector<base::FilePath::StringType> GetExtensionsForArcMimeType(
+    const std::string& mime_type);
+
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_UTIL_H_