Convert utility process extension Unpacker IPC to mojo

extensions/common/extension_utility_types.h

Index: extensions/common/extension_utility_types.h
diff --git a/extensions/common/extension_utility_types.h b/extensions/common/extension_utility_types.h
new file mode 100644
index 0000000000000000000000000000000000000000..84fbe3cdf0f58e2cbdf38e4f822e1dce3545b09d
--- /dev/null
+++ b/extensions/common/extension_utility_types.h
@@ -0,0 +1,17 @@
+// Copyright 2017 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.
+
+#ifndef EXTENSIONS_COMMON_EXTENSION_UTILITY_TYPES_H_
+#define EXTENSIONS_COMMON_EXTENSION_UTILITY_TYPES_H_
+
+#include <tuple>
+#include <vector>
+
+#include "base/files/file_path.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/gfx/ipc/skia/gfx_skia_param_traits.h"
+
+using DecodedImages = std::vector<std::tuple<SkBitmap, base::FilePath>>;
+
+#endif  // EXTENSIONS_COMMON_EXTENSION_UTILITY_TYPES_H_