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

content/public/browser/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_BLOB_CONTEXT_H_
+#define CONTENT_PUBLIC_BROWSER_BLOB_CONTEXT_H_
+
+#include "base/callback_forward.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+// A handle to Blobs that can be stored outside of content/.
+class BlobHandle {
+ public:
+  virtual ~BlobHandle() {}
+  virtual std::string uuid() = 0;
+
+ protected:
+  BlobHandle() {}
+
+  DISALLOW_COPY_AND_ASSIGN(BlobHandle);
+};
+
+// Used to coin Blobs in the browser process. For use on the UI thread.
+class CONTENT_EXPORT BlobContext {

[michaeln, 2014/05/08 23:03:18]

i'm not sure when CONTENT_EXPORT is needed and when it's not on these
interfaces. i see a mix of usage in the /public/browser directory. if it's not
needed definitely prefer to not use the macro.

[tommycli, 2014/05/09 16:10:17]

Done.

+ public:
+  typedef base::Callback<void(scoped_ptr<BlobHandle>)> BlobCallback;
+
+  virtual void CreateMemoryBackedBlob(
+      const char* data, size_t length, const BlobCallback& callback) = 0;
+
+ protected:
+  virtual ~BlobContext() {}
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_BLOB_CONTEXT_H_