Add V8IncrementalMarkingStartUserVisible to webview flags

Change-Id: Ie6b0e949d554ecbbf24829cea3c5dbe9c2af13a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5823951
Reviewed-by: Francois Pierre Doray <fdoray@chromium.org>
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1348158}
diff --git a/android_webview/java/src/org/chromium/android_webview/common/ProductionSupportedFlagList.java b/android_webview/java/src/org/chromium/android_webview/common/ProductionSupportedFlagList.java
index 7a413fd..0e7e766 100644
--- a/android_webview/java/src/org/chromium/android_webview/common/ProductionSupportedFlagList.java
+++ b/android_webview/java/src/org/chromium/android_webview/common/ProductionSupportedFlagList.java
@@ -773,6 +773,7 @@
         Flag.baseFeature("V8SingleThreadedGCInBackgroundNoIncrementalMarking"),
         Flag.baseFeature("V8SingleThreadedGCInBackgroundParallelPause"),
         Flag.baseFeature("V8UpdateLimitAfterLoading"),
+        Flag.baseFeature("V8IncrementalMarkingStartUserVisible"),
         Flag.baseFeature("WebAssemblyMoreAggressiveCodeCaching"),
         Flag.baseFeature("WebAssemblyTurboshaft"),
         Flag.baseFeature("WebAssemblyTurboshaftInstructionSelection"),