Add truncation to StreamCopyOrMoveImpl and test case.

content/browser/fileapi/file_system_operation_impl_unittest.cc

Index: content/browser/fileapi/file_system_operation_impl_unittest.cc
diff --git a/content/browser/fileapi/file_system_operation_impl_unittest.cc b/content/browser/fileapi/file_system_operation_impl_unittest.cc
index afbe664aaf2b3233a9ded3ebfd43aab94a848997..b6a1c46177a1981f9cff6979571d6bb6354f59e7 100644
--- a/content/browser/fileapi/file_system_operation_impl_unittest.cc
+++ b/content/browser/fileapi/file_system_operation_impl_unittest.cc
@@ -1287,4 +1287,21 @@ TEST_F(FileSystemOperationImplTest,
   EXPECT_EQ(expected_usage, usage);
 }
 
+TEST_F(FileSystemOperationImplTest,
+       TestCopySuccessSrcFileWithDifferentFileSize) {
+  FileSystemURL src_file(CreateFile("src"));
+  FileSystemURL dest_file(CreateFile("dest"));
+  operation_runner()->Truncate(dest_file, 6, RecordStatusCallback());
+  base::RunLoop().RunUntilIdle();
+
+  operation_runner()->Copy(src_file,
+                           dest_file,
+                           FileSystemOperation::OPTION_NONE,
+                           FileSystemOperationRunner::CopyProgressCallback(),
+                           RecordStatusCallback());
+  base::RunLoop().RunUntilIdle();

[tzik, 2014/09/03 02:07:43]

This doesn't run the modified part of the code untile we enable the stream copy
for sandboxed filesystem...

Can we use Run() instead of RunUntilIdle()?

[iseki, 2014/09/03 03:28:21]

Done.

+  EXPECT_EQ(0, GetFileSize("dest"));
+  EXPECT_EQ(base::File::FILE_OK, status());
+}
+
 }  // namespace content