Add FileWriteMode::kCreateOrFail

test/file.h

Index: test/file.h
diff --git a/test/file.h b/test/file.h
new file mode 100644
index 0000000000000000000000000000000000000000..a9987b4d6f311306eb0a2a7fa7d0f2490eca9454
--- /dev/null
+++ b/test/file.h
@@ -0,0 +1,45 @@
+// Copyright 2015 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_TEST_FILE_H_
+#define CRASHPAD_TEST_FILE_H_
+
+#include "base/files/file_path.h"
+#include "util/file/file_io.h"
+
+namespace crashpad {
+namespace test {
+
+//! \brief Determines whether a file exists.
+//!
+//! \param[in] path The path to check for existence.
+//!
+//! \return `true` if \a path exists. `false` if it does not exist. If an error
+//!     other than “file not found” occurs when searching for \a path, returns
+//!     `false` with a gtest failure added.
+bool FileExists(const base::FilePath& path);
+
+//! \brief Determines the size of a file.
+//!
+//! \param[in] path The path of the file to check. The file must exist.
+//!
+//! \return The size of the file at \a path. If the file does not exist, or an
+//!     error occurs when attempting to determine its size, returns `-1` with a
+//!     gtest failure added.
+FileOffset FileSize(const base::FilePath& path);
+
+}  // namespace test
+}  // namespace crashpad
+
+#endif  // CRASHPAD_TEST_FILE_H_