DevTools: Make sure a entry of flamechart is visible after reveal

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 195 matching lines @@
     var timeLeft = this._cancelWindowTimesAnimation ? this._pendingAnimationTimeLeft : this._timeWindowLeft;
     var timeRight = this._cancelWindowTimesAnimation ? this._pendingAnimationTimeRight : this._timeWindowRight;
     var entryStartTime = timelineData.entryStartTimes[entryIndex];
     var entryTotalTime = timelineData.entryTotalTimes[entryIndex];
     var entryEndTime = entryStartTime + entryTotalTime;
     var minEntryTimeWindow = Math.min(entryTotalTime, timeRight - timeLeft);
 
     var y = this._levelToHeight(timelineData.entryLevels[entryIndex]);
     this.setScrollOffset(y, this._barHeight);
 
+    var minVisibleWidthPx = 30;
+    var futurePixelToTime = (timeRight - timeLeft) / this._offsetWidth;
+    minEntryTimeWindow = Math.max(minEntryTimeWindow, futurePixelToTime * minVisibleWidthPx);
     if (timeLeft > entryEndTime) {
       var delta = timeLeft - entryEndTime + minEntryTimeWindow;
       this._flameChartDelegate.requestWindowTimes(timeLeft - delta, timeRight - delta);
     } else if (timeRight < entryStartTime) {
       var delta = entryStartTime - timeRight + minEntryTimeWindow;
       this._flameChartDelegate.requestWindowTimes(timeLeft + delta, timeRight + delta);
     }
   }
 
   /**
@@ skipping 1371 matching lines @@
   }
 
   /**
    * @override
    * @return {number}
    */
   boundarySpan() {
     return this._maximumBoundaries - this._minimumBoundaries;
   }
 };