Fix 117074: Panels [WIN]: Crash data shows a stack trace consistently involving PanelManager

chrome/browser/notifications/balloon_collection_impl.h

Index: chrome/browser/notifications/balloon_collection_impl.h
diff --git a/chrome/browser/notifications/balloon_collection_impl.h b/chrome/browser/notifications/balloon_collection_impl.h
index 749c9e0180edda08580454abe801627a5fe8e23a..f505463680a26cf7a5b64c4771c9a731743406b0 100644
--- a/chrome/browser/notifications/balloon_collection_impl.h
+++ b/chrome/browser/notifications/balloon_collection_impl.h
@@ -143,6 +143,10 @@ class BalloonCollectionImpl : public BalloonCollection,
     // to be repositioned.
     bool ComputeOffsetToMoveAbovePanels(const gfx::Rect& panel_bounds);
 
+    void enable_computing_panel_offset() {
+      need_to_compute_panel_offset_ = true;
+    }
+
    private:
     // Layout parameters
     int VerticalEdgeMargin() const;
@@ -161,6 +165,10 @@ class BalloonCollectionImpl : public BalloonCollection,
     Placement placement_;
     gfx::Rect work_area_;
 
+    // The flag that indicates that the panel offset computation should be
+    // performed.
+    bool need_to_compute_panel_offset_;
+
     // The offset that guarantees that the notificaitions shown in the
     // lower-right or lower-left corner of the screen will go above currently
     // shown panels and will not be obscured by them.