Allow BlobDataHandles to be copied, and have their UUIDs read, on any thread.

webkit/browser/blob/blob_storage_context.h

 // Copyright (c) 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 WEBKIT_BROWSER_BLOB_BLOB_STORAGE_CONTEXT_H_
 #define WEBKIT_BROWSER_BLOB_BLOB_STORAGE_CONTEXT_H_
 
 #include <map>
 #include <string>
 
@@ skipping 11 matching lines @@
 class Time;
 }
 
 namespace content {
 class BlobStorageHost;
 }
 
 namespace webkit_blob {
 
 class BlobDataHandle;
+class BlobDataHandleShared;

[michaeln, 2014/04/28 18:25:22]

this doesn't look meaningful since it's really an inner class, is this needed?

[ericu, 2014/04/28 18:43:01]

Done.

 
 // This class handles the logistics of blob Storage within the browser process,
 // and maintains a mapping from blob uuid to the data. The class is single
 // threaded and should only be used on the IO thread.
 // In chromium, there is one instance per profile.
 class WEBKIT_STORAGE_BROWSER_EXPORT BlobStorageContext
     : public base::SupportsWeakPtr<BlobStorageContext> {
  public:
   BlobStorageContext();
   ~BlobStorageContext();
 
   scoped_ptr<BlobDataHandle> GetBlobDataFromUUID(const std::string& uuid);
   scoped_ptr<BlobDataHandle> GetBlobDataFromPublicURL(const GURL& url);
 
   // Useful for coining blobs from within the browser process. If the
   // blob cannot be added due to memory consumption, returns NULL.
   scoped_ptr<BlobDataHandle> AddFinishedBlob(const BlobData* blob_data);
 
   // Useful for coining blob urls from within the browser process.
   bool RegisterPublicBlobURL(const GURL& url, const std::string& uuid);
   void RevokePublicBlobURL(const GURL& url);
 
  private:
   friend class content::BlobStorageHost;
-  friend class BlobDataHandle;
+  friend class BlobDataHandle::BlobDataHandleShared;
   friend class ViewBlobInternalsJob;
 
   enum EntryFlags {
     BEING_BUILT = 1 << 0,
     EXCEEDED_MEMORY = 1 << 1,
   };
 
   struct BlobMapEntry {
     int refcount;
     int flags;
@@ skipping 42 matching lines @@
   // we count only the items of TYPE_DATA which are held in memory and not
   // items of TYPE_FILE.
   int64 memory_usage_;
 
   DISALLOW_COPY_AND_ASSIGN(BlobStorageContext);
 };
 
 }  // namespace webkit_blob
 
 #endif  // WEBKIT_BROWSER_BLOB_BLOB_STORAGE_CONTEXT_H_