1 files changed, 21 insertions, 0 deletions
diff --git a/chrome/browser/notifications/balloon_collection_mac.mm b/chrome/browser/notifications/balloon_collection_mac.mm
index 7615415..d31bc39 100644
--- a/chrome/browser/notifications/balloon_collection_mac.mm
+++ b/chrome/browser/notifications/balloon_collection_mac.mm
@@ -43,6 +43,27 @@ void BalloonCollectionImpl::PositionBalloons(bool reposition) {
   [NSAnimationContext endGrouping];
 }
 
+void BalloonCollectionImpl::SetPositionPreference(
+    PositionPreference position) {
+  if (position == DEFAULT_POSITION)
+    position = UPPER_RIGHT;
+
+  // All positioning schemes are vertical, but mac
+  // uses a vertically reversed screen orientation.
+  if (position == UPPER_RIGHT)
+    layout_.set_placement(Layout::VERTICALLY_FROM_BOTTOM_RIGHT);
+  else if (position == UPPER_LEFT)
+    layout_.set_placement(Layout::VERTICALLY_FROM_BOTTOM_LEFT);
+  else if (position == LOWER_LEFT)
+    layout_.set_placement(Layout::VERTICALLY_FROM_TOP_LEFT);
+  else if (position == LOWER_RIGHT)
+    layout_.set_placement(Layout::VERTICALLY_FROM_TOP_RIGHT);
+  else
+    NOTREACHED();
+
+  PositionBalloons(true);
+}
+
 // static
 BalloonCollection* BalloonCollection::Create() {
   return new BalloonCollectionImpl();