[friction] add auto-baseline updating (#8917)

Fixes: #8916

---

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Author: pq

tool/github.sh

@@ -135,6 +135,9 @@ elif [ "VERIFY_BOT" = "$BOT" ] ; then
 
   if [ $EXIT_STATUS -ne 0 ]; then
     echo -e "${RED}${BOLD}Build failed: New verification issues were detected.${NC}"
+    echo -e "${YELLOW}To update the baselines with these new issues, run:${NC}"
+    echo -e "${YELLOW}  ./tool/update_baselines.sh${NC}"
+    echo -e "${YELLOW}from the repository root and commit the changes.${NC}"
     exit 1
   fi
 

tool/update_baselines.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+# Copyright 2026 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+if [ ! -f "build.gradle.kts" ]; then
+  echo "Error: This script must be run from the repository root directory."
+  exit 1
+fi
+
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BOLD='\033[1m'
+NC='\033[0m' # None (Reset)
+
+echo -e "${BOLD}Running plugin verification...${NC}"
+
+rm -rf build/reports/pluginVerifier
+
+VERSIONS=$(ls tool/baseline)
+
+if [ -z "$VERSIONS" ]; then
+  echo -e "${YELLOW}Warning: No baseline directories found in tool/baseline.${NC}"
+  exit 0
+fi
+
+echo -e "${BOLD}Found versions to update: $VERSIONS${NC}"
+
+for version in $VERSIONS; do
+  echo -e "${BOLD}Verifying version $version...${NC}"
+  ./gradlew verifyPlugin -PsingleIdeVersion=$version --no-configuration-cache --no-daemon || true
+
+  echo -e "${BOLD}Processing baseline for $version...${NC}"
+  BASELINE="tool/baseline/$version/verifier-baseline.txt"
+  REPORT=$(find build/reports/pluginVerifier -path "*-$version.*/report.md" | head -n 1)
+
+  if [ -f "$REPORT" ]; then
+    echo "Extracting issues from $REPORT"    
+    mkdir -p "$(dirname "$BASELINE")"
+    grep "^*" "$REPORT" | sort > "$BASELINE"
+    echo -e "${GREEN}Updated baseline at $BASELINE${NC}"
+  else
+    echo -e "${YELLOW}Warning: Report does not exist for version $version. Skipping.${NC}"
+  fi
+done
+
+echo -e "${BOLD}Done updating baselines.${NC}"