arc: Use the MIME type returned by the container to handle content URLs

chrome/browser/chromeos/arc/fileapi/arc_content_file_system_url_util_unittest.cc

 // 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.
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chromeos/arc/fileapi/arc_content_file_system_url_util.h"
 #include "chrome/browser/chromeos/fileapi/external_file_url_util.h"
 #include "content/public/common/url_constants.h"
 #include "storage/browser/fileapi/file_system_url.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 60 matching lines @@
       base::FilePath(kContentFileSystemMountPointPath)
           .Append(base::FilePath::FromUTF8Unsafe(EscapeArcUrl(arc_url)));
   storage::FileSystemURL file_system_url =
       storage::FileSystemURL::CreateForTest(GURL(),  // origin
                                             storage::kFileSystemTypeArcContent,
                                             path);
 
   EXPECT_EQ(arc_url, FileSystemUrlToArcUrl(file_system_url));
 }
 
+TEST(ArcContentFileSystemUrlUtilTest, PathToArcUrl) {
+  GURL arc_url("content://org.chromium.foo/bar/baz");
+
+  base::FilePath path =
+      base::FilePath(kContentFileSystemMountPointPath)
+          .Append(base::FilePath::FromUTF8Unsafe(EscapeArcUrl(arc_url)));
+  EXPECT_EQ(arc_url, PathToArcUrl(path));
+}
+
 }  // namespace arc