DevTools: do not invalidate total layout each time console message is added.

BUG=352557
NOTRY=true

Review URL: https://codereview.chromium.org/216693002

git-svn-id: svn://svn.chromium.org/blink/trunk@170307 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/devtools/front_end/InspectorView.js

@@ -412,6 +412,10 @@ WebInspector.InspectorView.prototype = {
      */
     setErrorAndWarningCounts: function(errors, warnings)
     {
+        if (this._errors === errors && this._warnings === warnings)
+            return;
+        this._errors = errors;
+        this._warnings = warnings;
         this._errorWarningCountElement.classList.toggle("hidden", !errors && !warnings);
         this._errorWarningCountElement.removeChildren();