Browser side support (sans UI) for desktop notifications....

chrome/browser/notifications/desktop_notification_service_win.cc

+// Copyright (c) 2009 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 "chrome/browser/notifications/desktop_notification_service.h"
+
+#include "app/l10n_util.h"
+#include "app/resource_bundle.h"
+#include "base/string_piece.h"
+#include "base/string_util.h"
+#include "base/values.h"
+#include "chrome/browser/browser_list.h"
+#include "chrome/browser/chrome_thread.h"
+#include "chrome/browser/notifications/notification_object_proxy.h"
+#include "chrome/browser/renderer_host/render_process_host.h"
+#include "chrome/browser/renderer_host/site_instance.h"
+#include "chrome/browser/worker_host/worker_process_host.h"
+#include "chrome/common/child_process_host.h"
+#include "grit/browser_resources.h"
+#include "grit/generated_resources.h"
+
+// Creates a data:xxxx URL which contains the full HTML for a notification
+// using supplied icon, title, and text, run through a template which contains
+// the standard formatting for notifications.
+static string16 CreateDataUrl(const GURL& icon_url, const string16& title,
+    const string16& body) {
+  const base::StringPiece template_html(
+      ResourceBundle::GetSharedInstance().GetRawDataResource(
+          IDR_NOTIFICATION_HTML));
+
+  if (template_html.empty()) {
+    NOTREACHED() << "unable to load template. ID: " << IDR_NOTIFICATION_HTML;
+    return EmptyString16();
+  }
+
+  std::vector<string16> subst;
+  if (icon_url.is_valid())
+    subst.push_back(UTF8ToUTF16(icon_url.spec()));
+  else
+    subst.push_back(EmptyString16());
+
+  subst.push_back(title);
+  subst.push_back(body);
+
+  if (icon_url.is_valid()) {
+    subst.push_back(ASCIIToUTF16("block"));
+    subst.push_back(ASCIIToUTF16("60"));
+  } else {
+    subst.push_back(ASCIIToUTF16("none"));
+    subst.push_back(ASCIIToUTF16("5"));
+  }
+
+  string16 format_string = ASCIIToUTF16("data:text/html;charset=utf-8,"
+                                        + template_html.as_string());
+  return ReplaceStringPlaceholders(format_string, subst, NULL);
+}
+
+// This will call the notification manager on the UI thread to actually
+// put the notification with the requested parameters on the desktop.
+void DesktopNotificationService::ShowNotification(
+    const Notification& notification) {
+  SiteInstance* site_instance = SiteInstance::CreateSiteInstance(profile_);
+  // TODO(johnnyg): When UI Manager is available, add from here.
+  //  ui_manager_->Add(notification, profile_, site_instance);
+}
+
+// Shows a notification bubble which contains the contents of url.
+bool DesktopNotificationService::ShowDesktopNotification(
+    const GURL& origin, const GURL& url, int process_id, int route_id,
+    NotificationSource source, int notification_id) {
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
+  NotificationObjectProxy* proxy =
+      new NotificationObjectProxy(process_id, route_id,
+                                  notification_id,
+                                  source == WorkerNotification);
+  Notification notif(origin, url, proxy);
+  ShowNotification(notif);
+  return true;
+}
+
+// Shows a notification constructed from an icon, title, and text.
+bool DesktopNotificationService::ShowDesktopNotificationText(
+    const GURL& origin, const GURL& icon, const string16& title,
+    const string16& text, int process_id, int route_id,
+    NotificationSource source, int notification_id) {
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
+  NotificationObjectProxy* proxy =
+      new NotificationObjectProxy(process_id, route_id,
+                                  notification_id,
+                                  source == WorkerNotification);
+  // "upconvert" the string parameters to a data: URL.
+  string16 data_url = CreateDataUrl(icon, title, text);
+  Notification notif(origin, GURL(data_url), proxy);
+  ShowNotification(notif);
+  return true;
+}
+