DevTools: Make sure non-collapsible flamechart groups are treated as expanded.

third_party/WebKit/Source/devtools/front_end/perf_ui/FlameChart.js

 /**
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1109 matching lines @@
           currentOffset += style.height;
       }
       var isFirstOnLevel = groupIndex >= 0 && level === groups[groupIndex].startLevel;
       var thisLevelIsVisible =
           parentGroupIsVisible && (visible || isFirstOnLevel && groups[groupIndex].style.useFirstLineForOverview);
       if (level < levelCount) {
         var height;
         if (groupIndex >= 0) {
           var group = groups[groupIndex];
           var style = group.style;
-          height = isFirstOnLevel && !style.shareHeaderLine || !group.expanded ? style.height :
-                                                                                 (style.itemsHeight || this._barHeight);
+          height = isFirstOnLevel && !style.shareHeaderLine || (style.collapsible && !group.expanded) ?
+              style.height :
+              (style.itemsHeight || this._barHeight);
         } else {
           height = this._barHeight;
         }
         this._visibleLevels[level] = thisLevelIsVisible;
         this._visibleLevelOffsets[level] = currentOffset;
         this._visibleLevelHeights[level] = height;
       }
       if (thisLevelIsVisible || (parentGroupIsVisible && style.shareHeaderLine && isFirstOnLevel))
         currentOffset += this._visibleLevelHeights[level];
     }
@@ skipping 420 matching lines @@
   }
 
   /**
    * @override
    * @return {number}
    */
   boundarySpan() {
     return this._maximumBoundaries - this._minimumBoundaries;
   }
 };