[Storage] Blob Storage Refactoring pt 1

storage/browser/blob/blob_url_request_job_factory.cc

 // Copyright (c) 2011 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.
 
 #include "storage/browser/blob/blob_url_request_job_factory.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/strings/string_util.h"
@@ skipping 50 matching lines @@
 
 net::URLRequestJob* BlobProtocolHandler::MaybeCreateJob(
     net::URLRequest* request, net::NetworkDelegate* network_delegate) const {
   return new storage::BlobURLRequestJob(request,
                                         network_delegate,
                                         LookupBlobData(request),
                                         file_system_context_.get(),
                                         file_loop_proxy_.get());
 }
 
-scoped_refptr<storage::BlobData> BlobProtocolHandler::LookupBlobData(
+scoped_ptr<BlobDataSnapshot> BlobProtocolHandler::LookupBlobData(
     net::URLRequest* request) const {
   BlobDataHandle* blob_data_handle = GetRequestedBlobDataHandle(request);
   if (blob_data_handle)
-    return blob_data_handle->data();
+    return blob_data_handle->CreateSnapshot().Pass();
   if (!context_.get())
     return NULL;
 
   // Support looking up based on uuid, the FeedbackExtensionAPI relies on this.
   // TODO(michaeln): Replace this use case and others like it with a BlobReader
   // impl that does not depend on urlfetching to perform this function.
   const std::string kPrefix("blob:uuid/");
   if (!StartsWithASCII(request->url().spec(), kPrefix, true))
     return NULL;
   std::string uuid = request->url().spec().substr(kPrefix.length());
   scoped_ptr<BlobDataHandle> handle = context_->GetBlobDataFromUUID(uuid);
-  return handle.get() ? handle->data() : NULL;
+  scoped_ptr<BlobDataSnapshot> snapshot;
+  if (handle) {
+    snapshot = handle->CreateSnapshot().Pass();
+    SetRequestedBlobDataHandle(request, handle.Pass());
+  }
+  return snapshot.Pass();
 }
 
 }  // namespace storage