Blobs: Mechanism for creating Blobs in browser process, then transferring to renderer.

content/public/browser/fileapi/blob_context.h

+// Copyright 2014 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 CONTENT_PUBLIC_BROWSER_FILEAPI_BLOB_CONTEXT_H_
+#define CONTENT_PUBLIC_BROWSER_FILEAPI_BLOB_CONTEXT_H_

[michaeln, 2014/05/08 21:11:57]

It may make more sense to put this in public/browser directly. The only reason
the impl is in fileapi is because of the close relationship betweek Blobs and
Files in javascript land. That doesn't matter at the content api layer.

[tommycli, 2014/05/08 22:43:03]

Done.

+
+#include "base/callback_forward.h"
+#include "content/common/content_export.h"
+
+namespace webkit_blob {

[michaeln, 2014/05/08 21:11:57]

I think we'll also need a content api wrapper for the
webkit_blob::BlodDataHandle class. Everything under /webkit is being migrated to
/content, that class is an impl detail of the content lib and shouldn't be
directly accessed by /chrome.

[tommycli, 2014/05/08 22:43:03]

Done.

+class BlobDataHandle;
+}
+
+namespace content {
+
+// Used to coin Blobs in the browser process. For use on the UI thread.
+class CONTENT_EXPORT BlobContext {
+ public:
+  typedef base::Callback<
+      void(scoped_ptr<webkit_blob::BlobDataHandle>)> BlobCallback;
+
+  virtual void CreateMemoryBackedBlob(
+      const char* data, size_t length, const BlobCallback& callback) = 0;
+
+ protected:
+  virtual ~BlobContext() {}
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_FILEAPI_BLOB_CONTEXT_H_