Show warmup in perf

Change-Id: I522619ee27b8499cac6d611ba5a99f98b68d181b
diff --git a/tools/perf/utils.js b/tools/perf/utils.js
index 13cd09c..e699f32 100644
--- a/tools/perf/utils.js
+++ b/tools/perf/utils.js
@@ -1,11 +1,12 @@
 // Copyright (c) 2024, the R8 project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
-function getSingleResult(benchmark, commit, resultName, resultIteration = 0) {
+function getSingleResult(benchmark, commit, resultName, resultIteration = 0, warmup = false) {
   if (!(benchmark in commit.benchmarks)) {
     return NaN;
   }
-  const allResults = commit.benchmarks[benchmark].results;
+  const benchmarkData = commit.benchmarks[benchmark];
+  const allResults = warmup ? benchmarkData.warmup : benchmarkData.results;
   const resultsForIteration = allResults[resultIteration];
   // If a given iteration does not declare a result, then the result
   // was the same as the first run.
@@ -15,14 +16,25 @@
   return resultsForIteration[resultName];
 }
 
-function getAllResults(benchmark, commit, resultName, transformation) {
+function getAllResults(benchmark, commit, resultName, transformation, warmup = false) {
+  if (!(benchmark in commit.benchmarks)) {
+    return NaN;
+  }
+  const benchmarkData = commit.benchmarks[benchmark];
+  if (warmup && !('warmup' in benchmarkData)) {
+    return NaN;
+  }
   const result = [];
-  const allResults = commit.benchmarks[benchmark].results;
+  const allResults = warmup ? benchmarkData.warmup : benchmarkData.results;
   for (var iteration = 0; iteration < allResults.length; iteration++) {
-    result.push(getSingleResult(benchmark, commit, resultName, iteration));
+    result.push(getSingleResult(benchmark, commit, resultName, iteration, warmup));
   }
   if (transformation) {
     return transformation(result);
   }
   return result;
 }
+
+function getAllWarmupResults(benchmark, commit, resultName, transformation) {
+  return getAllResults(benchmark, commit, resultName, transformation, true);
+}