Browser side support (sans UI) for desktop notifications.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/194108

Review URL: http://codereview.chromium.org/271052

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@28696 0039d316-1c4b-4281-b951-d872f2087c98

11 files changed, 958 insertions, 0 deletions

diff --git a/chrome/browser/notifications/balloons.h b/chrome/browser/notifications/balloons.h
new file mode 100644
index 0000000..6191d53
--- /dev/null
+++ b/chrome/browser/notifications/balloons.h
@@ -0,0 +1,200 @@
+// 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.
+
+// Handles the visible notification (or balloons).
+
+#ifndef CHROME_BROWSER_NOTIFICATIONS_BALLOONS_H_
+#define CHROME_BROWSER_NOTIFICATIONS_BALLOONS_H_
+
+#include <deque>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/gfx/point.h"
+#include "base/gfx/rect.h"
+#include "base/gfx/size.h"
+#include "base/scoped_ptr.h"
+#include "chrome/browser/notifications/notification.h"
+
+class Balloon;
+class BalloonView;
+class Profile;
+class SiteInstance;
+
+class BalloonCloseListener {
+ public:
+  virtual ~BalloonCloseListener() { }
+
+  // Called when a balloon is closed.
+  virtual void OnBalloonClosed(Balloon* source) = 0;
+};
+
+class BalloonSpaceChangeListener {
+ public:
+  virtual ~BalloonSpaceChangeListener() { }
+
+  // Called when there is more or less space for balloons due to
+  // monitor size changes or balloons disappearing.
+  virtual void OnBalloonSpaceChanged() = 0;
+};
+
+class BalloonCollectionInterface {
+ public:
+  virtual ~BalloonCollectionInterface() {}
+
+  // Adds a new balloon for the specified notification.
+  virtual void Add(const Notification& notification,
+                   Profile* profile,
+                   SiteInstance* site_instance) = 0;
+
+  // Is there room to add another notification?
+  virtual bool HasSpace() const = 0;
+};
+
+typedef std::deque<Balloon*> Balloons;
+
+// Represents a Notification on the screen.
+class Balloon {
+ public:
+  Balloon(const Notification& notification,
+          Profile* profile,
+          SiteInstance* site_instance,
+          BalloonCloseListener* listener);
+  ~Balloon();
+
+  const Notification& notification() const {
+    return notification_;
+  }
+
+  Profile* profile() const {
+    return profile_;
+  }
+
+  SiteInstance* site_instance() const {
+    return site_instance_;
+  }
+
+  void SetPosition(const gfx::Point& upper_left, bool reposition);
+  void SetSize(const gfx::Size& size);
+  void Show();
+  void Close();
+
+  const gfx::Point& position() const;
+  const gfx::Size& size() const;
+
+ private:
+  Profile* profile_;
+  SiteInstance* site_instance_;
+  Notification notification_;
+  BalloonCloseListener* close_listener_;
+  scoped_ptr<BalloonView> balloon_view_;
+  gfx::Point position_;
+  gfx::Size size_;
+  DISALLOW_COPY_AND_ASSIGN(Balloon);
+};
+
+class BalloonCollection : public BalloonCollectionInterface,
+                          public BalloonCloseListener {
+ public:
+  explicit BalloonCollection();
+
+  BalloonSpaceChangeListener* space_change_listener() { return listener_; }
+  void set_space_change_listener(BalloonSpaceChangeListener* listener) {
+    listener_ = listener;
+  }
+
+  // BalloonCollectionInterface overrides
+  virtual void Add(const Notification& notification,
+                   Profile* profile,
+                   SiteInstance* site_instance);
+  virtual void ShowAll();
+  virtual void HideAll();
+  virtual bool HasSpace() const;
+
+  // BalloonCloseListener interface
+  virtual void OnBalloonClosed(Balloon* source);
+
+ protected:
+  // Overridable by unit tests.
+  virtual Balloon* MakeBalloon(const Notification& notification,
+                               Profile* profile,
+                               SiteInstance* site_instance) {
+    return new Balloon(notification, profile, site_instance, this);
+  }
+
+ private:
+  // The number of balloons being displayed.
+  int count() const { return balloons_.size(); }
+
+  // Calculates layout values for the balloons including
+  // the scaling, the max/min sizes, and the upper left corner of each.
+  class Layout {
+   public:
+    Layout();
+
+    // Refresh the work area and balloon placement.
+    void OnDisplaySettingsChanged();
+
+    int min_balloon_width() const;
+    int max_balloon_width() const;
+    int min_balloon_height() const;
+    int max_balloon_height() const;
+
+    // Returns both the total length available and the maximum
+    // allowed per balloon.
+    //
+    // The length may be a height or length depending on the way that
+    // balloons are laid out.
+    const void GetMaxLengths(int* max_balloon_length, int* total_length) const;
+
+    // Scale the size to count in the system font factor.
+    int ScaleSize(int size) const;
+
+    // Refresh the cached values for work area and drawing metrics.
+    // This is done automatically first time and the application should
+    // call this method to re-acquire metrics after any
+    // resolution or settings change.
+    //
+    // Return true if and only if a metric changed.
+    bool RefreshSystemMetrics();
+
+    // Returns the starting value for NextUpperLeftPosition.
+    gfx::Point GetStartPosition() const;
+
+    // Compute the position for the next balloon.
+    //   Modifies origin.
+    //   Returns the position of the upper left coordinate for the given
+    //   balloon.
+    gfx::Point NextPosition(const gfx::Size& balloon_size,
+                            gfx::Point* origin) const;
+
+   private:
+    enum Placement {
+      HORIZONTALLY_FROM_BOTTOM_LEFT,
+      HORIZONTALLY_FROM_BOTTOM_RIGHT,
+      VERTICALLY_FROM_TOP_RIGHT,
+      VERTICALLY_FROM_BOTTOM_RIGHT
+    };
+
+    // Minimum and maximum size of balloon
+    static const int kBalloonMinWidth = 300;
+    static const int kBalloonMaxWidth = 300;
+    static const int kBalloonMinHeight = 90;
+    static const int kBalloonMaxHeight = 120;
+
+    static Placement placement_;
+    gfx::Rect work_area_;
+    double font_scale_factor_;
+    DISALLOW_COPY_AND_ASSIGN(Layout);
+  };
+
+  // Non-owned pointer to an object listening for space changes.
+  BalloonSpaceChangeListener* listener_;
+
+  Balloons balloons_;
+  Layout layout_;
+  DISALLOW_COPY_AND_ASSIGN(BalloonCollection);
+};
+
+#endif  // CHROME_BROWSER_NOTIFICATIONS_BALLOONS_H_
diff --git a/chrome/browser/notifications/desktop_notification_service.cc b/chrome/browser/notifications/desktop_notification_service.cc
new file mode 100644
index 0000000..0df73d7
--- /dev/null
+++ b/chrome/browser/notifications/desktop_notification_service.cc
@@ -0,0 +1,234 @@
+// 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/thread.h"
+#include "chrome/browser/browser_list.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/chrome_thread.h"
+#include "chrome/browser/notifications/notification.h"
+#include "chrome/browser/notifications/notification_object_proxy.h"
+#include "chrome/browser/notifications/notifications_prefs_cache.h"
+#include "chrome/browser/profile.h"
+#include "chrome/browser/renderer_host/render_process_host.h"
+#include "chrome/browser/renderer_host/render_view_host.h"
+#include "chrome/browser/renderer_host/site_instance.h"
+#include "chrome/browser/tab_contents/infobar_delegate.h"
+#include "chrome/browser/tab_contents/tab_contents.h"
+#include "chrome/browser/worker_host/worker_process_host.h"
+#include "chrome/common/child_process_host.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/common/pref_service.h"
+#include "chrome/common/render_messages.h"
+#include "webkit/api/public/WebNotificationPresenter.h"
+#include "grit/chromium_strings.h"
+#include "grit/generated_resources.h"
+#include "grit/theme_resources.h"
+
+using WebKit::WebNotificationPresenter;
+
+// A task object which calls the renderer to inform the web page that the
+// permission request has completed.
+class NotificationPermissionCallbackTask : public Task {
+ public:
+  NotificationPermissionCallbackTask(int process_id, int route_id,
+      int request_id)
+      : process_id_(process_id),
+        route_id_(route_id),
+        request_id_(request_id) {
+  }
+
+  virtual void Run() {
+    DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
+    RenderViewHost* host = RenderViewHost::FromID(process_id_, route_id_);
+    if (host)
+      host->Send(new ViewMsg_PermissionRequestDone(route_id_, request_id_));
+  }
+
+ private:
+  int process_id_;
+  int route_id_;
+  int request_id_;
+};
+
+// The delegate for the infobar shown when an origin requests notification
+// permissions.
+class NotificationPermissionInfoBarDelegate : public ConfirmInfoBarDelegate {
+ public:
+  NotificationPermissionInfoBarDelegate(TabContents* contents,
+                                        const GURL& origin,
+                                        int callback_context)
+      : ConfirmInfoBarDelegate(contents),
+        origin_(origin),
+        profile_(contents->profile()),
+        process_id_(contents->process()->id()),
+        route_id_(contents->render_view_host()->routing_id()),
+        callback_context_(callback_context),
+        action_taken_(false) {
+  }
+
+  // Overridden from ConfirmInfoBarDelegate:
+  virtual void InfoBarClosed() {
+    if (!action_taken_)
+      UMA_HISTOGRAM_COUNTS("NotificationPermissionRequest.Ignored", 1);
+
+    base::Thread* io_thread = g_browser_process->io_thread();
+    if (io_thread && io_thread->message_loop()) {
+      io_thread->message_loop()->PostTask(FROM_HERE,
+        new NotificationPermissionCallbackTask(process_id_, route_id_,
+            callback_context_));
+    }
+
+    delete this;
+  }
+
+  virtual std::wstring GetMessageText() const {
+    return l10n_util::GetStringF(IDS_NOTIFICATION_PERMISSIONS,
+                                 UTF8ToWide(origin_.spec()));
+  }
+
+  virtual SkBitmap* GetIcon() const {
+    return ResourceBundle::GetSharedInstance().GetBitmapNamed(
+       IDR_PRODUCT_ICON_32);
+  }
+
+  virtual int GetButtons() const {
+    return BUTTON_OK | BUTTON_CANCEL | BUTTON_OK_DEFAULT;
+  }
+
+  virtual std::wstring GetButtonLabel(InfoBarButton button) const {
+    return button == BUTTON_OK ?
+        l10n_util::GetString(IDS_NOTIFICATION_PERMISSION_YES) :
+        l10n_util::GetString(IDS_NOTIFICATION_PERMISSION_NO);
+  }
+
+  virtual bool Accept() {
+    UMA_HISTOGRAM_COUNTS("NotificationPermissionRequest.Allowed", 1);
+    profile_->GetDesktopNotificationService()->GrantPermission(origin_);
+    action_taken_ = true;
+    return true;
+  }
+
+  virtual bool Cancel() {
+    UMA_HISTOGRAM_COUNTS("NotificationPermissionRequest.Denied", 1);
+    profile_->GetDesktopNotificationService()->DenyPermission(origin_);
+    action_taken_ = true;
+    return true;
+  }
+
+ private:
+  // The origin we are asking for permissions on.
+  GURL origin_;
+
+  // The Profile that we restore sessions from.
+  Profile* profile_;
+
+  // The callback information that tells us how to respond to javascript via
+  // the correct RenderView.
+  int process_id_;
+  int route_id_;
+  int callback_context_;
+
+  // Whether the user clicked one of the buttons.
+  bool action_taken_;
+
+  DISALLOW_COPY_AND_ASSIGN(NotificationPermissionInfoBarDelegate);
+};
+
+DesktopNotificationService::DesktopNotificationService(Profile* profile,
+    NotificationUIManager* ui_manager)
+    : profile_(profile),
+      ui_manager_(ui_manager) {
+  InitPrefs();
+}
+
+DesktopNotificationService::~DesktopNotificationService() {
+}
+
+// Initialize the cache with the allowed and denied origins, or
+// create the preferences if they don't exist yet.
+void DesktopNotificationService::InitPrefs() {
+  PrefService* prefs = profile_->GetPrefs();
+  ListValue* allowed_sites = NULL;
+  ListValue* denied_sites = NULL;
+
+  if (prefs->FindPreference(prefs::kDesktopNotificationAllowedOrigins))
+    allowed_sites =
+        prefs->GetMutableList(prefs::kDesktopNotificationAllowedOrigins);
+  else
+    prefs->RegisterListPref(prefs::kDesktopNotificationAllowedOrigins);
+
+  if (prefs->FindPreference(prefs::kDesktopNotificationDeniedOrigins))
+    denied_sites =
+        prefs->GetMutableList(prefs::kDesktopNotificationDeniedOrigins);
+  else
+    prefs->RegisterListPref(prefs::kDesktopNotificationDeniedOrigins);
+
+  prefs_cache_ = new NotificationsPrefsCache(allowed_sites, denied_sites);
+}
+
+void DesktopNotificationService::GrantPermission(const GURL& origin) {
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
+  PrefService* prefs = profile_->GetPrefs();
+  ListValue* allowed_sites =
+      prefs->GetMutableList(prefs::kDesktopNotificationAllowedOrigins);
+  ListValue* denied_sites =
+      prefs->GetMutableList(prefs::kDesktopNotificationDeniedOrigins);
+  // Remove from the black-list and add to the white-list.
+  StringValue* value = new StringValue(origin.spec());
+  denied_sites->Remove(*value);
+  allowed_sites->Append(value);
+  prefs->ScheduleSavePersistentPrefs();
+
+  // Schedule a cache update on the IO thread.
+  base::Thread* io_thread = g_browser_process->io_thread();
+  if (io_thread && io_thread->message_loop()) {
+    io_thread->message_loop()->PostTask(FROM_HERE,
+        NewRunnableMethod(prefs_cache_.get(),
+                          &NotificationsPrefsCache::CacheAllowedOrigin,
+                          origin));
+  }
+}
+
+void DesktopNotificationService::DenyPermission(const GURL& origin) {
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
+  PrefService* prefs = profile_->GetPrefs();
+  ListValue* allowed_sites =
+      prefs->GetMutableList(prefs::kDesktopNotificationAllowedOrigins);
+  ListValue* denied_sites =
+      prefs->GetMutableList(prefs::kDesktopNotificationDeniedOrigins);
+  StringValue* value = new StringValue(origin.spec());
+  // Remove from the white-list and add to the black-list.
+  allowed_sites->Remove(*value);
+  denied_sites->Append(value);
+  prefs->ScheduleSavePersistentPrefs();
+
+  // Schedule a cache update on the IO thread.
+  base::Thread* io_thread = g_browser_process->io_thread();
+  if (io_thread && io_thread->message_loop()) {
+    io_thread->message_loop()->PostTask(FROM_HERE,
+        NewRunnableMethod(prefs_cache_.get(),
+                          &NotificationsPrefsCache::CacheDeniedOrigin,
+                          origin));
+  }
+}
+
+void DesktopNotificationService::RequestPermission(
+    const GURL& origin, int callback_context) {
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
+  // Show an info bar requesting permission.
+  Browser* browser = BrowserList::GetLastActive();
+  if (!browser) {
+    // Reached during ui tests.
+    return;
+  }
+  TabContents* tab = browser->GetSelectedTabContents();
+  if (!tab)
+    return;
+  tab->AddInfoBar(new NotificationPermissionInfoBarDelegate(tab, origin,
+                                                            callback_context));
+}
diff --git a/chrome/browser/notifications/desktop_notification_service.h b/chrome/browser/notifications/desktop_notification_service.h
new file mode 100644
index 0000000..38e0b27
--- /dev/null
+++ b/chrome/browser/notifications/desktop_notification_service.h
@@ -0,0 +1,78 @@
+// 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.
+
+#ifndef CHROME_BROWSER_NOTIFICATIONS_DESKTOP_NOTIFICATION_SERVICE_H
+#define CHROME_BROWSER_NOTIFICATIONS_DESKTOP_NOTIFICATION_SERVICE_H
+
+#include <set>
+
+#include "base/basictypes.h"
+#include "chrome/browser/notifications/notification.h"
+#include "googleurl/src/gurl.h"
+
+class NotificationUIManager;
+class NotificationsPrefsCache;
+class PrefService;
+class Profile;
+class Task;
+
+// The DesktopNotificationService is an object, owned by the Profile,
+// which provides the creation of desktop "toasts" to web pages and workers.
+class DesktopNotificationService {
+ public:
+  enum NotificationSource {
+    PageNotification,
+    WorkerNotification
+  };
+
+  DesktopNotificationService(Profile* profile,
+                             NotificationUIManager* ui_manager);
+  ~DesktopNotificationService();
+
+  // Requests permission (using an info-bar) for a given origin.
+  // |callback_context| contains an opaque value to pass back to the
+  // requesting process when the info-bar finishes.
+  void RequestPermission(const GURL& origin, int callback_context);
+
+  // Takes a notification object and shows it in the UI.
+  void ShowNotification(const Notification& notification);
+
+  // Two ShowNotification methods: getting content either from remote
+  // URL or as local parameters.  These are called on the UI thread
+  // in response to IPCs from a child process running script. |origin|
+  // is the origin of the script.  |source| indicates whether the
+  // script is in a worker or page.  |notification_id| is an opaque
+  // value to be passed back to the process when events occur on
+  // this notification.
+  bool ShowDesktopNotification(const GURL& origin, const GURL& url,
+      int process_id, int route_id, NotificationSource source,
+      int notification_id);
+  bool ShowDesktopNotificationText(const GURL& origin, const GURL& icon,
+      const string16& title, const string16& text, int process_id,
+      int route_id, NotificationSource source, int notification_id);
+
+  // Methods to setup and modify permission preferences.
+  void GrantPermission(const GURL& origin);
+  void DenyPermission(const GURL& origin);
+
+  NotificationsPrefsCache* prefs_cache() { return prefs_cache_; }
+
+ private:
+  void InitPrefs();
+
+  // The profile which owns this object.
+  Profile* profile_;
+
+  // A cache of preferences which is accessible only on the IO thread
+  // to service synchronous IPCs.
+  scoped_refptr<NotificationsPrefsCache> prefs_cache_;
+
+  // Non-owned pointer to the notification manager which manages the
+  // UI for desktop toasts.
+  NotificationUIManager* ui_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(DesktopNotificationService);
+};
+
+#endif  // #ifndef CHROME_BROWSER_NOTIFICATIONS_DESKTOP_NOTIFICATION_SERVICE_H
diff --git a/chrome/browser/notifications/desktop_notification_service_linux.cc b/chrome/browser/notifications/desktop_notification_service_linux.cc
new file mode 100644
index 0000000..15148ce
--- /dev/null
+++ b/chrome/browser/notifications/desktop_notification_service_linux.cc
@@ -0,0 +1,30 @@
+// 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"
+
+bool DesktopNotificationService::ShowDesktopNotification(
+    const GURL& url,
+    const GURL&,
+    int process_id,
+    int route_id,
+    NotificationSource source,
+    int notification_id) {
+  // TODO(johnnyg): http://crbug.com/23954  Linux support coming soon.
+  return false;
+}
+
+bool DesktopNotificationService::ShowDesktopNotificationText(
+    const GURL& origin,
+    const GURL& url,
+    const string16& title,
+    const string16& text,
+    int process_id,
+    int route_id,
+    NotificationSource source,
+    int notification_id) {
+  // TODO(johnnyg): http://crbug.com/23066  Linux support coming soon.
+  // Coming soon.
+  return false;
+}
diff --git a/chrome/browser/notifications/desktop_notification_service_mac.mm b/chrome/browser/notifications/desktop_notification_service_mac.mm
new file mode 100644
index 0000000..42473c4
--- /dev/null
+++ b/chrome/browser/notifications/desktop_notification_service_mac.mm
@@ -0,0 +1,30 @@
+// 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"
+
+bool DesktopNotificationService::ShowDesktopNotification(
+    const GURL& url,
+    const GURL&,
+    int process_id,
+    int route_id,
+    NotificationSource source,
+    int notification_id) {
+  // TODO(johnnyg): http://crbug.com/23066  Mac support coming soon.
+  return false;
+}
+
+bool DesktopNotificationService::ShowDesktopNotificationText(
+    const GURL& origin,
+    const GURL& url,
+    const string16& title,
+    const string16& text,
+    int process_id,
+    int route_id,
+    NotificationSource source,
+    int notification_id) {
+  // TODO(johnnyg): http://crbug.com/23066  Integration with Growl will go here
+  // Coming soon.
+  return false;
+}
diff --git a/chrome/browser/notifications/desktop_notification_service_win.cc b/chrome/browser/notifications/desktop_notification_service_win.cc
new file mode 100644
index 0000000..41e3e29
--- /dev/null
+++ b/chrome/browser/notifications/desktop_notification_service_win.cc
@@ -0,0 +1,97 @@
+// 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;
+}
+
diff --git a/chrome/browser/notifications/notification.h b/chrome/browser/notifications/notification.h
new file mode 100644
index 0000000..ed63e04
--- /dev/null
+++ b/chrome/browser/notifications/notification.h
@@ -0,0 +1,58 @@
+// 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.
+
+#ifndef CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_H_
+#define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_H_
+
+#include "base/basictypes.h"
+#include "chrome/browser/notifications/notification_object_proxy.h"
+#include "googleurl/src/gurl.h"
+
+// Representation of an notification to be shown to the user.  All
+// notifications at this level are HTML, although they may be
+// data: URLs representing simple text+icon notifications.
+class Notification {
+ public:
+  Notification(const GURL& origin_url, const GURL& content_url,
+               NotificationObjectProxy* proxy)
+      : origin_url_(origin_url),
+        content_url_(content_url),
+        proxy_(proxy) {
+  }
+
+  Notification(const Notification& notification)
+      : origin_url_(notification.origin_url()),
+        content_url_(notification.content_url()),
+        proxy_(notification.proxy()) {
+  }
+
+  // The URL (may be data:) containing the contents for the notification.
+  const GURL& content_url() const { return content_url_; }
+
+  // The origin URL of the script which requested the notification.
+  const GURL& origin_url() const { return origin_url_; }
+
+  void Display() const { proxy()->Display(); }
+  void Error() const { proxy()->Error(); }
+  void Close(bool by_user) const { proxy()->Close(by_user); }
+
+ private:
+  NotificationObjectProxy* proxy() const { return proxy_.get(); }
+
+  // The Origin of the page/worker which created this notification.
+  GURL origin_url_;
+
+  // The URL of the HTML content of the toast (may be a data: URL for simple
+  // string-based notifications).
+  GURL content_url_;
+
+  // A proxy object that allows access back to the JavaScript object that
+  // represents the notification, for firing events.
+  scoped_refptr<NotificationObjectProxy> proxy_;
+
+  // Disallow assign.  Copy constructor written above.
+  void operator=(const Notification&);
+};
+
+#endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_H_
diff --git a/chrome/browser/notifications/notification_object_proxy.cc b/chrome/browser/notifications/notification_object_proxy.cc
new file mode 100644
index 0000000..f230d19
--- /dev/null
+++ b/chrome/browser/notifications/notification_object_proxy.cc
@@ -0,0 +1,68 @@
+// 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/notification_object_proxy.h"
+
+#include "base/message_loop.h"
+#include "base/string16.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/chrome_thread.h"
+#include "chrome/browser/renderer_host/render_view_host.h"
+#include "chrome/common/render_messages.h"
+
+NotificationObjectProxy::NotificationObjectProxy(int process_id, int route_id,
+    int notification_id, bool worker)
+    : process_id_(process_id),
+      route_id_(route_id),
+      notification_id_(notification_id),
+      worker_(worker) {
+}
+
+void NotificationObjectProxy::Display() {
+  if (worker_) {
+    // TODO(johnnyg): http://crbug.com/23065  Worker support coming soon.
+    NOTREACHED();
+  } else {
+    DeliverMessage(new ViewMsg_PostDisplayToNotificationObject(
+        route_id_, notification_id_));
+  }
+}
+
+void NotificationObjectProxy::Error() {
+  if (worker_) {
+    // TODO(johnnyg): http://crbug.com/23065  Worker support coming soon.
+    NOTREACHED();
+  } else {
+    DeliverMessage(new ViewMsg_PostErrorToNotificationObject(
+        route_id_, notification_id_, string16()));
+  }
+}
+
+void NotificationObjectProxy::Close(bool by_user) {
+  if (worker_) {
+    // TODO(johnnyg): http://crbug.com/23065  Worker support coming soon.
+    NOTREACHED();
+  } else {
+    DeliverMessage(new ViewMsg_PostCloseToNotificationObject(
+        route_id_, notification_id_, by_user));
+  }
+}
+
+void NotificationObjectProxy::DeliverMessage(IPC::Message* message) {
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
+  MessageLoop* io_loop = ChromeThread::GetMessageLoop(ChromeThread::IO);
+  if (io_loop) {
+    io_loop->PostTask(FROM_HERE,
+        NewRunnableMethod(this, &NotificationObjectProxy::Send, message));
+  }
+}
+
+// Deferred method which runs on the IO thread and sends a message to the
+// proxied notification, routing it through the correct host in the browser.
+void NotificationObjectProxy::Send(IPC::Message* message) {
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
+  RenderViewHost* host = RenderViewHost::FromID(process_id_, route_id_);
+  if (host)
+    host->Send(message);
+}
diff --git a/chrome/browser/notifications/notification_object_proxy.h b/chrome/browser/notifications/notification_object_proxy.h
new file mode 100644
index 0000000..168bd8a
--- /dev/null
+++ b/chrome/browser/notifications/notification_object_proxy.h
@@ -0,0 +1,51 @@
+// 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.
+
+#ifndef CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OBJECT_PROXY_H_
+#define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OBJECT_PROXY_H_
+
+#include "base/ref_counted.h"
+
+class MessageLoop;
+namespace IPC {
+class Message;
+}
+
+// A NotificationObjectProxy stands in for the JavaScript Notification object
+// which corresponds to a notification toast on the desktop.  It can be signaled
+// when various events occur regarding the desktop notification, and the
+// attached JS listeners will be invoked in the renderer or worker process.
+class NotificationObjectProxy :
+    public base::RefCountedThreadSafe<NotificationObjectProxy> {
+ public:
+  // Creates a Proxy object with the necessary callback information.
+  NotificationObjectProxy(int process_id, int route_id,
+                          int notification_id, bool worker);
+
+  // To be called when the desktop notification is actually shown.
+  void Display();
+
+  // To be called when the desktop notification cannot be shown due to an
+  // error.
+  void Error();
+
+  // To be called when the desktop notification is closed.  If closed by a
+  // user explicitly (as opposed to timeout), |by_user| should be true.
+  void Close(bool by_user);
+
+ private:
+  // Called on UI thread to schedule a message for sending.
+  void DeliverMessage(IPC::Message* message);
+
+  // Called via Task on IO thread to actually send a message to a notification.
+  void Send(IPC::Message* message);
+
+  // Callback information to find the JS Notification object where it lives.
+  int process_id_;
+  int route_id_;
+  int notification_id_;
+  bool worker_;
+};
+
+#endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OBJECT_PROXY_H_
diff --git a/chrome/browser/notifications/notifications_prefs_cache.cc b/chrome/browser/notifications/notifications_prefs_cache.cc
new file mode 100644
index 0000000..c5663e4
--- /dev/null
+++ b/chrome/browser/notifications/notifications_prefs_cache.cc
@@ -0,0 +1,67 @@
+// 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/notifications_prefs_cache.h"
+
+#include "base/string_util.h"
+#include "base/utf_string_conversions.h"
+#include "chrome/browser/chrome_thread.h"
+#include "chrome/common/pref_service.h"
+#include "webkit/api/public/WebNotificationPresenter.h"
+
+NotificationsPrefsCache::NotificationsPrefsCache(
+    ListValue* allowed, ListValue* denied) {
+  ListValue::const_iterator i;
+  std::wstring origin;
+  if (allowed) {
+    for (i = allowed->begin(); i != allowed->end(); ++i) {
+      (*i)->GetAsString(&origin);
+      allowed_origins_.insert(GURL(WideToUTF8(origin)));
+    }
+  }
+  if (denied) {
+    for (i = denied->begin(); i != denied->end(); ++i) {
+      (*i)->GetAsString(&origin);
+      denied_origins_.insert(GURL(WideToUTF8(origin)));
+    }
+  }
+}
+
+void NotificationsPrefsCache::CacheAllowedOrigin(
+    const GURL& origin) {
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
+  std::set<GURL>::iterator iter;
+  allowed_origins_.insert(origin);
+  if ((iter = denied_origins_.find(origin)) != denied_origins_.end())
+    denied_origins_.erase(iter);
+}
+
+void NotificationsPrefsCache::CacheDeniedOrigin(
+    const GURL& origin) {
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
+  std::set<GURL>::iterator iter;
+  denied_origins_.insert(origin);
+  if ((iter = allowed_origins_.find(origin)) != allowed_origins_.end())
+    allowed_origins_.erase(iter);
+}
+
+int NotificationsPrefsCache::HasPermission(const GURL& origin) {
+  if (IsOriginAllowed(origin))
+    return WebKit::WebNotificationPresenter::PermissionAllowed;
+  if (IsOriginDenied(origin))
+    return WebKit::WebNotificationPresenter::PermissionDenied;
+  return WebKit::WebNotificationPresenter::PermissionNotAllowed;
+}
+
+bool NotificationsPrefsCache::IsOriginAllowed(
+    const GURL& origin) {
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
+  return (allowed_origins_.find(origin) != allowed_origins_.end());
+}
+
+bool NotificationsPrefsCache::IsOriginDenied(
+    const GURL& origin) {
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
+  return (denied_origins_.find(origin) != denied_origins_.end());
+}
diff --git a/chrome/browser/notifications/notifications_prefs_cache.h b/chrome/browser/notifications/notifications_prefs_cache.h
new file mode 100644
index 0000000..e873da7
--- /dev/null
+++ b/chrome/browser/notifications/notifications_prefs_cache.h
@@ -0,0 +1,45 @@
+// 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.
+
+#ifndef CHROME_BROWSER_NOTIFICATIONS_NOTIFICATIONS_PREFS_CACHE_H
+#define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATIONS_PREFS_CACHE_H
+
+#include <set>
+
+#include "base/ref_counted.h"
+#include "googleurl/src/gurl.h"
+
+class ListValue;
+
+// Class which caches notification preferences.
+// Construction occurs on the UI thread when the contents
+// of the profile preferences are initially cached.  Once constructed
+// this class should only be accessed on the IO thread.
+class NotificationsPrefsCache :
+    public base::RefCountedThreadSafe<NotificationsPrefsCache> {
+ public:
+  NotificationsPrefsCache(ListValue* allowed, ListValue* denied);
+
+  // Checks to see if a given origin has permission to create desktop
+  // notifications.  Returns a constant from WebNotificationPresenter
+  // class.
+  int HasPermission(const GURL& origin);
+
+  // Updates the cache with a new origin allowed or denied.
+  void CacheAllowedOrigin(const GURL& origin);
+  void CacheDeniedOrigin(const GURL& origin);
+
+ private:
+  // Helper functions which read preferences.
+  bool IsOriginAllowed(const GURL& origin);
+  bool IsOriginDenied(const GURL& origin);
+
+  // Storage of the actual preferences.
+  std::set<GURL> allowed_origins_;
+  std::set<GURL> denied_origins_;
+
+  DISALLOW_COPY_AND_ASSIGN(NotificationsPrefsCache);
+};
+
+#endif  // #ifndef CHROME_BROWSER_NOTIFICATIONS_NOTIFICATIONS_PREFS_CACHE_H