[NOT FOR REVIEW] Significantly simplify the PlatformNotificationService //content API.

content/browser/notifications/notification_id_generator.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/notifications/notification_id_generator.h"
+
+#include <sstream>
+
+#include "base/files/file_path.h"
+#include "base/hash.h"
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "content/public/browser/browser_context.h"
+#include "url/gurl.h"
+
+namespace content {
+
+NotificationIdGenerator::NotificationIdGenerator(
+    BrowserContext* browser_context,
+    int render_process_id)
+    : browser_context_(browser_context), render_process_id_(render_process_id) {
+}
+
+NotificationIdGenerator::~NotificationIdGenerator() {
+}
+
+std::string NotificationIdGenerator::GenerateForPersistentNotification(
+    const GURL& origin,
+    const std::string& tag,
+    int64_t persistent_notification_id) const {
+  std::stringstream stream;
+
+  stream << base::Hash(browser_context_->GetPath().value());
+  stream << browser_context_->IsOffTheRecord();
+  stream << origin.GetOrigin();
+
+  // Persistent notification ids are unique for the lifetime of the notification
+  // database, orthogonal to the renderer that created the notification.
+
+  stream << !!tag.size();
+  if (tag.size())
+    stream << tag;
+  else
+    stream << base::Int64ToString(persistent_notification_id);
+
+  return stream.str();
+}
+
+std::string NotificationIdGenerator::GenerateForNonPersistentNotification(
+    const GURL& origin,
+    const std::string& tag,
+    int non_persistent_notification_id) const {
+  std::stringstream stream;
+
+  stream << base::Hash(browser_context_->GetPath().value());
+  stream << browser_context_->IsOffTheRecord();
+  stream << origin.GetOrigin();
+
+  // Non-persistent notification ids are unique per renderer process.
+  stream << render_process_id_;
+
+  stream << !!tag.size();
+  if (tag.size())
+    stream << tag;
+  else
+    stream << base::IntToString(non_persistent_notification_id);
+
+  return stream.str();
+}
+
+}  // namespace content