Implement GetJobResponse and merge JobData into DataManager.

content/browser/background_fetch/background_fetch_job_response_data.cc

+// Copyright 2017 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 "content/browser/background_fetch/background_fetch_job_response_data.h"
+
+namespace content {
+
+BackgroundFetchJobResponseData::BackgroundFetchJobResponseData(
+    size_t num_requests,
+    const BackgroundFetchResponseCompleteCallback& completion_callback)
+    : blobs_(num_requests),
+      num_requests_(num_requests),
+      completion_callback_(std::move(completion_callback)) {}
+
+BackgroundFetchJobResponseData::~BackgroundFetchJobResponseData() {}
+
+void BackgroundFetchJobResponseData::AddResponse(
+    int request_num,
+    std::unique_ptr<BlobHandle> response) {
+  blobs_[request_num] = std::move(response);
+  completed_requests_++;
+
+  if (completed_requests_ == num_requests_) {
+    std::move(completion_callback_).Run(std::move(blobs_));
+  }
+}
+
+bool BackgroundFetchJobResponseData::IsComplete() {
+  return completed_requests_ == num_requests_;
+}
+
+}  // namespace content