Fetch notification action icons and pass them through in resources.

content/child/notifications/pending_notification.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 "content/child/notifications/pending_notification.h"
+
+#include "base/barrier_closure.h"
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/location.h"
+#include "base/thread_task_runner_handle.h"
+#include "content/public/common/notification_resources.h"
+#include "url/gurl.h"
+
+namespace content {
+
+PendingNotification::PendingNotification(
+    const scoped_refptr<base::SingleThreadTaskRunner>& main_task_runner)
+    : main_task_runner_(main_task_runner), weak_factory_(this) {}
+
+PendingNotification::~PendingNotification() {}
+
+void PendingNotification::FetchResources(
+    const blink::WebNotificationData& notification_data,
+    const base::Closure& fetches_finished_callback) {
+  // TODO(mvanouwerkerk): Add a timeout mechanism: crbug.com/579137
+
+  size_t num_actions = notification_data.actions.size();
+  action_icons_.resize(num_actions);
+
+  size_t num_closures = 1 /* notification icon */ + num_actions;
+  fetches_finished_barrier_closure_ =
+      base::BarrierClosure(num_closures, fetches_finished_callback);
+
+  FetchImageResource(notification_data.icon,
+                     base::Bind(&PendingNotification::DidFetchNotificationIcon,
+                                weak_factory_.GetWeakPtr()));
+  for (size_t i = 0; i < num_actions; i++) {
+    FetchImageResource(notification_data.actions[i].icon,
+                       base::Bind(&PendingNotification::DidFetchActionIcon,
+                                  weak_factory_.GetWeakPtr(), i));
+  }
+}
+
+NotificationResources PendingNotification::GetResources() const {
+  NotificationResources resources;
+  resources.notification_icon = notification_icon_;
+  resources.action_icons = action_icons_;
+  return resources;
+}
+
+void PendingNotification::FetchImageResource(
+    const blink::WebURL& image_web_url,
+    const ImageLoadCompletedCallback& image_callback) {
+  if (image_web_url.isEmpty()) {
+    image_callback.Run(SkBitmap());
+    return;
+  }
+
+  // Explicitly convert the WebURL to a GURL before passing it to a different
+  // thread. This is important because WebURLs must not be passed between
+  // threads, and per base::Bind() semantics conversion would otherwise be done
+  // on the receiving thread.
+  GURL image_gurl(image_web_url);
+
+  scoped_refptr<NotificationImageLoader> image_loader(
+      new NotificationImageLoader(image_callback,
+                                  base::ThreadTaskRunnerHandle::Get(),
+                                  main_task_runner_));
+  image_loaders_.push_back(image_loader);
+  main_task_runner_->PostTask(
+      FROM_HERE, base::Bind(&NotificationImageLoader::StartOnMainThread,
+                            image_loader, image_gurl));
+}
+
+void PendingNotification::DidFetchNotificationIcon(
+    const SkBitmap& notification_icon) {
+  notification_icon_ = notification_icon;
+  fetches_finished_barrier_closure_.Run();
+}
+
+void PendingNotification::DidFetchActionIcon(size_t action_index,
+                                             const SkBitmap& action_icon) {
+  DCHECK_LT(action_index, action_icons_.size());
+
+  action_icons_[action_index] = action_icon;
+  fetches_finished_barrier_closure_.Run();
+}
+
+}  // namespace content