mojo: Fix leveldb unittests by making fs::Directories cloneable.

components/filesystem/directory_impl_unittest.cc

 // 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.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
 #include <string>
 
@@ skipping 136 matching lines @@
     // Attempt to open that directory as a file. This must fail!
     FilePtr file;
     error = FileError::FAILED;
     directory->OpenFile("my_file", GetProxy(&file), kFlagRead | kFlagOpen,
                         Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
     EXPECT_EQ(FileError::NOT_A_FILE, error);
   }
 }
 
+TEST_F(DirectoryImplTest, Clone) {
+  DirectoryPtr clone_one;
+  DirectoryPtr clone_two;
+  FileError error;
+
+  {
+    DirectoryPtr directory;
+    GetTemporaryRoot(&directory);
+
+    directory->Clone(GetProxy(&clone_one));
+    directory->Clone(GetProxy(&clone_two));
+
+    // Original temporary directory goes out of scope here; shouldn't be
+    // deleted since it has clones.
+  }
+
+  std::string data("one two three");
+  {
+    clone_one->WriteFile("data", mojo::Array<uint8_t>::From(data),
+                         Capture(&error));
+    ASSERT_TRUE(clone_one.WaitForIncomingResponse());
+    EXPECT_EQ(FileError::OK, error);
+  }
+
+  {
+    mojo::Array<uint8_t> file_contents;
+    clone_two->ReadEntireFile("data", Capture(&error, &file_contents));
+    ASSERT_TRUE(clone_two.WaitForIncomingResponse());
+    EXPECT_EQ(FileError::OK, error);
+
+    EXPECT_EQ(data, file_contents.To<std::string>());
+  }
+}
+
 TEST_F(DirectoryImplTest, WriteFileReadFile) {
   DirectoryPtr directory;
   GetTemporaryRoot(&directory);
   FileError error;
 
   std::string data("one two three");
   {
     directory->WriteFile("data", mojo::Array<uint8_t>::From(data),
                          Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
@@ skipping 72 matching lines @@
                          Capture(&error));
     ASSERT_TRUE(directory.WaitForIncomingResponse());
     EXPECT_EQ(FileError::NOT_A_FILE, error);
   }
 }
 
 // TODO(vtl): Test delete flags.
 
 }  // namespace
 }  // namespace filesystem