Add WebNotificationTray

ash/system/tray/system_tray.cc

Index: ash/system/tray/system_tray.cc
diff --git a/ash/system/tray/system_tray.cc b/ash/system/tray/system_tray.cc
index b2b9eca423e25ef2be4ce0c3f57870460b1d6dee..4b4eae351af7fa96d825926a644de03c7b4f80e9 100644
--- a/ash/system/tray/system_tray.cc
+++ b/ash/system/tray/system_tray.cc
@@ -139,8 +139,8 @@ SystemTray::SystemTray()
       update_observer_(NULL),
       user_observer_(NULL),
       should_show_launcher_(false),
-      shelf_alignment_(SHELF_ALIGNMENT_BOTTOM),
-      default_bubble_height_(0) {
+      default_bubble_height_(0),
+      hide_notifications_(false) {
   tray_container_ = new internal::SystemTrayContainer;
   tray_container_->SetLayoutManager(new views::BoxLayout(
       views::BoxLayout::kHorizontal, 0, 0, 0));
@@ -298,6 +298,16 @@ void SystemTray::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {
   }
 }
 
+void SystemTray::SetHideNotifications(bool hide_notifications) {
+  if (notification_bubble_.get())
+    notification_bubble_->SetVisible(!hide_notifications);
+  hide_notifications_ = hide_notifications;
+}
+
+bool SystemTray::IsBubbleVisible() const {
+  return bubble_.get() && bubble_->IsVisible();
+}
+
 bool SystemTray::CloseBubbleForTest() const {
   if (!bubble_.get())
     return false;
@@ -462,6 +472,8 @@ void SystemTray::UpdateNotificationBubble() {
   if (arrow_offset >= 0)
     init_params.arrow_offset = arrow_offset;
   notification_bubble_->InitView(init_params);
+  if (hide_notifications_)
+    notification_bubble_->SetVisible(false);
 }
 
 void SystemTray::UpdateNotificationAnchor() {
@@ -474,11 +486,11 @@ void SystemTray::UpdateNotificationAnchor() {
 
 void SystemTray::SetBorder() {
   // Change the border padding for different shelf alignment.
-  if (shelf_alignment_ == SHELF_ALIGNMENT_BOTTOM) {
+  if (shelf_alignment() == SHELF_ALIGNMENT_BOTTOM) {
     set_border(views::Border::CreateEmptyBorder(0, 0,
         kPaddingFromBottomOfScreenBottomAlignment,
         kPaddingFromRightEdgeOfScreenBottomAlignment));
-  } else if (shelf_alignment_ == SHELF_ALIGNMENT_LEFT) {
+  } else if (shelf_alignment() == SHELF_ALIGNMENT_LEFT) {
     set_border(views::Border::CreateEmptyBorder(0,
         kPaddingFromEdgeOfScreenVerticalAlignment,
         kPaddingFromBottomOfScreenVerticalAlignment,
@@ -492,9 +504,9 @@ void SystemTray::SetBorder() {
 }
 
 void SystemTray::SetShelfAlignment(ShelfAlignment alignment) {
-  if (alignment == shelf_alignment_)
+  if (alignment == shelf_alignment())
     return;
-  shelf_alignment_ = alignment;
+  internal::TrayBackgroundView::SetShelfAlignment(alignment);
   UpdateAfterShelfAlignmentChange(alignment);
   SetBorder();
   tray_container_->SetLayoutManager(new views::BoxLayout(