[BlobAsync] Adding better error reporting and some new tests.

storage/browser/blob/blob_reader.h

 // Copyright 2015 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 STORAGE_BROWSER_BLOB_BLOB_READER_H_
 #define STORAGE_BROWSER_BLOB_BLOB_READER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "net/base/completion_callback.h"
 #include "storage/browser/storage_browser_export.h"
+#include "storage/common/blob_storage/blob_storage_constants.h"
 
 class GURL;
 
 namespace base {
 class FilePath;
 class SequencedTaskRunner;
 class TaskRunner;
 class Time;
 }
 
@@ skipping 95 matching lines @@
              std::unique_ptr<FileStreamReaderProvider> file_stream_provider,
              base::SequencedTaskRunner* file_task_runner);
 
   bool total_size_calculated() const { return total_size_calculated_; }
 
  private:
   Status ReportError(int net_error);
   void InvalidateCallbacksAndDone(int net_error, net::CompletionCallback done);
 
   void AsyncCalculateSize(const net::CompletionCallback& done,
-                          bool async_succeeded);
+                          bool async_succeeded,
+                          IPCBlobCreationCancelCode reason);
   Status CalculateSizeImpl(const net::CompletionCallback& done);
   bool AddItemLength(size_t index, uint64_t length);
   bool ResolveFileItemLength(const BlobDataItem& item,
                              int64_t total_length,
                              uint64_t* output_length);
   void DidGetFileItemLength(size_t index, int64_t result);
   void DidCountSize();
 
   // For reading the blob.
   // Returns if we're done, PENDING_IO if we're waiting on async.
@@ skipping 48 matching lines @@
 
   net::CompletionCallback size_callback_;
   net::CompletionCallback read_callback_;
 
   base::WeakPtrFactory<BlobReader> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(BlobReader);
 };
 
 }  // namespace storage
 #endif  // STORAGE_BROWSER_BLOB_BLOB_READER_H_