Update callers of CreateFileSystemOperation so more detailed error codes can be returned. Where app…

webkit/fileapi/file_system_file_stream_reader.cc

 // Copyright (c) 2012 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 "webkit/fileapi/file_system_file_stream_reader.h"
 
 #include "base/file_util_proxy.h"
 #include "base/platform_file.h"
 #include "base/single_thread_task_runner.h"
 #include "net/base/file_stream.h"
@@ skipping 35 matching lines @@
 
 FileSystemFileStreamReader::~FileSystemFileStreamReader() {
 }
 
 int FileSystemFileStreamReader::Read(
     net::IOBuffer* buf, int buf_len,
     const net::CompletionCallback& callback) {
   if (local_file_reader_.get())
     return local_file_reader_->Read(buf, buf_len, callback);
   DCHECK(!has_pending_create_snapshot_);
+  base::PlatformFileError error_code;
   FileSystemOperation* operation =
-      file_system_context_->CreateFileSystemOperation(url_);
-  if (!operation)
-    return net::ERR_INVALID_URL;
+      file_system_context_->CreateFileSystemOperation(url_, &error_code);
+  if (error_code != base::PLATFORM_FILE_OK)
+    return net::PlatformFileErrorToNetError(error_code);
   has_pending_create_snapshot_ = true;
   operation->CreateSnapshotFile(
       url_,
       base::Bind(&FileSystemFileStreamReader::DidCreateSnapshot,
                  weak_factory_.GetWeakPtr(),
                  base::Bind(&ReadAdapter, weak_factory_.GetWeakPtr(),
                             make_scoped_refptr(buf), buf_len, callback),
                  callback));
   return net::ERR_IO_PENDING;
 }
@@ skipping 19 matching lines @@
 
   local_file_reader_.reset(
       new LocalFileStreamReader(
           file_system_context_->task_runners()->file_task_runner(),
           platform_path, initial_offset_, base::Time()));
 
   read_closure.Run();
 }
 
 }  // namespace fileapi