Deflake paint/invalidation/animated-gif*.html

third_party/WebKit/LayoutTests/fast/repaint/resources/text-based-repaint.js

 // Asynchronous tests should manually call finishRepaintTest at the appropriate
 // time.
 window.testIsAsync = false;
 window.outputRepaintRects = true;
 
 // All repaint tests are asynchronous.
 if (window.testRunner)
     testRunner.waitUntilDone();
 
 if (window.internals) {
@@ skipping 53 matching lines @@
     internals.stopTrackingRepaints(document);
 
     // Play nice with JS tests which may want to print out assert results.
     if (window.isJsTest)
         window.outputRepaintRects = false;
 
     if (window.outputRepaintRects)
         testRunner.setCustomTextOutput(repaintRects);
 
     if (window.afterTest)
-        window.afterTest();
+        window.afterTest(repaintRects);
 
-    // Play nice with async JS tests which want to notifyDone themselves.
-    if (!window.jsTestIsAsync)
+    // Play nice with async JS tests and harness tests which want to notifyDone themselves.
+    if (!window.jsTestIsAsync && !window.add_completion_callback)
         testRunner.notifyDone();
 }