Media Galleries API Metadata: Make Blob native extension bindings available to multiple extensions.

chrome/renderer/extensions/blob_native_handler.h

+// Copyright 2013 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 CHROME_RENDERER_EXTENSIONS_BLOB_NATIVE_HANDLER_H_
+#define CHROME_RENDERER_EXTENSIONS_BLOB_NATIVE_HANDLER_H_
+
+#include "chrome/renderer/extensions/chrome_v8_extension.h"
+
+namespace extensions {
+
+// This native handler is used to extract Blobs' UUIDs and pass them over to the
+// browser process extension implementation via argument modification. This is
+// necessary to support extension functions that take Blob parameters, as Blobs
+// are not serialized and sent over to the browser process in the normal way.
+//
+// Blobs sent via this method don't have their ref-counts incremented, so the
+// app using this technique must be sure to keep a reference.
+class BlobNativeHandler : public ObjectBackedNativeHandler {
+ public:
+  explicit BlobNativeHandler(ChromeV8Context* context);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_RENDERER_EXTENSIONS_BLOB_NATIVE_HANDLER_H_