[BackgroundSync] Add browser side support for SyncRegistration.done

content/browser/background_sync/background_sync_registration.cc

 // 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.
 
 #include "content/browser/background_sync/background_sync_registration.h"
 
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/single_thread_task_runner.h"
+#include "base/thread_task_runner_handle.h"
+
 namespace content {
 
 const BackgroundSyncRegistration::RegistrationId
     BackgroundSyncRegistration::kInvalidRegistrationId = -1;
 
 const BackgroundSyncRegistration::RegistrationId
     BackgroundSyncRegistration::kInitialId = 0;
 
+BackgroundSyncRegistration::BackgroundSyncRegistration() = default;
+BackgroundSyncRegistration::~BackgroundSyncRegistration() = default;
+
 bool BackgroundSyncRegistration::Equals(
     const BackgroundSyncRegistration& other) const {
   return options_.Equals(other.options_);
 }
 
 bool BackgroundSyncRegistration::IsValid() const {
   return id_ != kInvalidRegistrationId;
 }
 
+void BackgroundSyncRegistration::AddDoneCallback(
+    const StateCallback& callback) {
+  DCHECK(!HasCompleted());
+  notify_done_callbacks_.push_back(callback);
+}
+
+void BackgroundSyncRegistration::RunDoneCallbacks() {
+  DCHECK(HasCompleted());
+
+  for (auto& callback : notify_done_callbacks_) {
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
+        FROM_HERE, base::Bind(callback, sync_state_));
+  }
+
+  notify_done_callbacks_.clear();
+}
+
+bool BackgroundSyncRegistration::HasCompleted() const {
+  switch (sync_state_) {
+    case BACKGROUND_SYNC_STATE_PENDING:
+    case BACKGROUND_SYNC_STATE_FIRING:
+    case BACKGROUND_SYNC_STATE_UNREGISTERED_WHILE_FIRING:
+      return false;
+    case BACKGROUND_SYNC_STATE_FAILED:
+    case BACKGROUND_SYNC_STATE_SUCCESS:
+    case BACKGROUND_SYNC_STATE_UNREGISTERED:
+      return true;
+  }
+  NOTREACHED();
+  return false;
+}
+
 }  // namespace content