Fix the problem that notifications and panels overlap.

chrome/browser/notifications/balloon_collection_views.cc

 // Copyright (c) 2011 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/balloon_collection_impl.h"
 
 #include "chrome/browser/notifications/balloon.h"
 #include "chrome/browser/ui/views/notifications/balloon_view.h"
 #include "ui/base/events.h"
 #include "ui/gfx/rect.h"
@@ skipping 13 matching lines @@
 }
 
 int BalloonCollectionImpl::Layout::HorizontalEdgeMargin() const {
   return 2;
 }
 
 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);
 }
 
 base::EventStatus BalloonCollectionImpl::WillProcessEvent(
     const base::NativeEvent& event) {
   return base::EVENT_CONTINUE;
 }
 
 void BalloonCollectionImpl::DidProcessEvent(const base::NativeEvent& event) {
@@ skipping 45 matching lines @@
     layout_.set_placement(Layout::VERTICALLY_FROM_TOP_RIGHT);
   else if (position == UPPER_LEFT)
     layout_.set_placement(Layout::VERTICALLY_FROM_TOP_LEFT);
   else if (position == LOWER_LEFT)
     layout_.set_placement(Layout::VERTICALLY_FROM_BOTTOM_LEFT);
   else if (position == LOWER_RIGHT)
     layout_.set_placement(Layout::VERTICALLY_FROM_BOTTOM_RIGHT);
   else
     NOTREACHED();
 
+  layout_.ComputeOffsetToMoveAbovePanels(gfx::Rect());
   PositionBalloons(true);
 }
 
 // static
 BalloonCollection* BalloonCollection::Create() {
   return new BalloonCollectionImpl();
 }