Fix console viewport test failures with scroll anchoring.

third_party/WebKit/Source/devtools/front_end/console/ConsoleViewMessage.js

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 100 matching lines @@
         this._cachedHeight = this.contentElement().offsetHeight;
     },
 
     /**
      * @return {number}
      */
     fastHeight: function()
     {
         if (this._cachedHeight)
             return this._cachedHeight;
-        const defaultConsoleRowHeight = 18;  // Sync with consoleView.css
+        // This value reflects the 18px min-height of .console-message, plus the
+        // 1px border of .console-message-wrapper. Keep in sync with consoleView.css.
+        const defaultConsoleRowHeight = 19;
         if (this._message.type === WebInspector.ConsoleMessage.MessageType.Table) {
             var table = this._message.parameters[0];
             if (table && table.preview)
                 return defaultConsoleRowHeight * table.preview.properties.length;
         }
         return defaultConsoleRowHeight;
     },
 
     /**
      * @return {!WebInspector.ConsoleMessage}
@@ skipping 1208 matching lines @@
     {
         if (!this._wrapperElement) {
             WebInspector.ConsoleViewMessage.prototype.toMessageElement.call(this);
             this._wrapperElement.classList.toggle("collapsed", this._collapsed);
         }
         return this._wrapperElement;
     },
 
     __proto__: WebInspector.ConsoleViewMessage.prototype
 }