Adding an IO Data and keyed service to previews/

components/previews/previews_io_data.cc

+// Copyright 2016 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 "components/previews/previews_io_data.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "components/previews/previews_ui_service.h"
+
+namespace previews {
+
+PreviewsIOData::PreviewsIOData(
+    const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner,
+    const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner)
+    : ui_task_runner_(ui_task_runner),
+      io_task_runner_(io_task_runner),
+      weak_factory_(this) {}
+
+PreviewsIOData::~PreviewsIOData() {}
+
+void PreviewsIOData::Initialize(
+    base::WeakPtr<PreviewsUIService> previews_ui_service) {
+  DCHECK(ui_task_runner_->BelongsToCurrentThread());
+  previews_ui_service_ = previews_ui_service;
+
+  // Set up the IO thread portion of |this|.
+  io_task_runner_->PostTask(FROM_HERE,
+                            base::Bind(&PreviewsIOData::InitializeOnIOThread,
+                                       base::Unretained(this)));
+}
+
+void PreviewsIOData::InitializeOnIOThread() {
+  DCHECK(io_task_runner_->BelongsToCurrentThread());
+  ui_task_runner_->PostTask(
+      FROM_HERE, base::Bind(&PreviewsUIService::SetIOData, previews_ui_service_,
+                            weak_factory_.GetWeakPtr()));
+}
+
+}  // namespace previews