Check rect under-invalidations

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

Index: third_party/WebKit/LayoutTests/fast/repaint/resources/text-based-repaint.js
diff --git a/third_party/WebKit/LayoutTests/fast/repaint/resources/text-based-repaint.js b/third_party/WebKit/LayoutTests/fast/repaint/resources/text-based-repaint.js
index b038ff9088c90841e7470c9e11eaf4884c6b97dc..cbdccad1397b9a669071812d3e8290931cdb3649 100644
--- a/third_party/WebKit/LayoutTests/fast/repaint/resources/text-based-repaint.js
+++ b/third_party/WebKit/LayoutTests/fast/repaint/resources/text-based-repaint.js
@@ -8,8 +8,15 @@ window.generateMinimumRepaint = false; // See comments about 'Minimum repaint' b
 if (window.testRunner)
     testRunner.waitUntilDone();
 
-if (window.internals)
+if (window.internals) {
     internals.settings.setUseDefaultImageInterpolationQuality(true);
+    // TODO(wangxianzhu): Some spv2 tests crash with under-invalidation-checking
+    // because the extra display items between Subsequence/EndSubsequence for
+    // under-invalidation checking breaks paint chunks. Should fix this when fixing
+    // crbug.com/596983.
+    if (!internals.runtimeFlags.slimmingPaintV2Enabled)
+        internals.runtimeFlags.slimmingPaintUnderInvalidationCheckingEnabled = true;
+}
 
 function runRepaintTest()
 {