Fix the problem that notifications and panels overlap.

chrome/browser/notifications/balloon_collection_views.cc

Index: chrome/browser/notifications/balloon_collection_views.cc
diff --git a/chrome/browser/notifications/balloon_collection_views.cc b/chrome/browser/notifications/balloon_collection_views.cc
index c436df88881758b3090fd7f79486ebad823b81fe..f5ac0e4b1b2f89b02ab8179064f8e890c20ede7f 100644
--- a/chrome/browser/notifications/balloon_collection_views.cc
+++ b/chrome/browser/notifications/balloon_collection_views.cc
@@ -31,6 +31,14 @@ int BalloonCollectionImpl::Layout::VerticalEdgeMargin() const {
   return 0;
 }
 
+bool BalloonCollectionImpl::Layout::NeedToMoveAboveLeftSidePanels() const {
+  return placement_ == VERTICALLY_FROM_BOTTOM_LEFT;
+}
+
+bool BalloonCollectionImpl::Layout::NeedToMoveAboveRightSidePanels() const {
+  return placement_ == VERTICALLY_FROM_BOTTOM_RIGHT;
+}
+
 void BalloonCollectionImpl::PositionBalloons(bool reposition) {
   PositionBalloonsInternal(reposition);
 }
@@ -96,6 +104,7 @@ void BalloonCollectionImpl::SetPositionPreference(
   else
     NOTREACHED();
 
+  layout_.ComputeOffsetToMoveAbovePanels(gfx::Rect());
   PositionBalloons(true);
 }