CL for perf tryjob on win

third_party/WebKit/LayoutTests/resources/run-after-layout-and-paint.js

Index: third_party/WebKit/LayoutTests/resources/run-after-layout-and-paint.js
diff --git a/third_party/WebKit/LayoutTests/resources/run-after-layout-and-paint.js b/third_party/WebKit/LayoutTests/resources/run-after-layout-and-paint.js
index c69cc800f5ca6aad98fb351971fb7668c626a2cc..c6560aa21f3513ba47fc8be27c51934338d83902 100644
--- a/third_party/WebKit/LayoutTests/resources/run-after-layout-and-paint.js
+++ b/third_party/WebKit/LayoutTests/resources/run-after-layout-and-paint.js
@@ -21,6 +21,15 @@
 //       ... // some code which modifies style/layout
 //     }, true);
 
+if (window.internals) {
+    // 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 runAfterLayoutAndPaint(callback, autoNotifyDone) {
     if (!window.testRunner) {
         // For manual test. Delay 500ms to allow us to see the visual change