update build benchmark to match #7589 (#7600)

dev/devicelab/lib/framework/utils.dart

@@ -237,6 +237,14 @@ Future<int> flutter(String command,
       canFail: canFail, env: env);
 }
 
+/// Runs a `flutter` command and returns the standard output as a string.
+Future<String> evalFlutter(String command,
+    {List<String> options: const <String>[], bool canFail: false, Map<String, String> env}) {
+  List<String> args = <String>[command]..addAll(options);
+  return eval(path.join(flutterDirectory.path, 'bin', 'flutter'), args,
+      canFail: canFail, env: env);
+}
+
 String get dartBin =>
     path.join(flutterDirectory.path, 'bin', 'cache', 'dart-sdk', 'bin', 'dart');
 

dev/devicelab/lib/tasks/perf_tests.dart

@@ -164,38 +164,42 @@ class BuildTest {
       await flutter('packages', options: <String>['get']);
 
       Stopwatch watch = new Stopwatch()..start();
-      await flutter('build', options: <String>[
+      String buildLog = await evalFlutter('build', options: <String>[
         'aot',
+        '-v',
         '--profile',
         '--no-pub',
         '--target-platform', 'android-arm'  // Generate blobs instead of assembly.
       ]);
       watch.stop();
 
-      int vmisolateSize = file("$testDirectory/build/aot/snapshot_aot_vmisolate").lengthSync();
+      RegExp metricExpression = new RegExp(r'([a-zA-Z]+)\(CodeSize\)\: (\d+)');
-      int isolateSize = file("$testDirectory/build/aot/snapshot_aot_isolate").lengthSync();
-      int instructionsSize = file("$testDirectory/build/aot/snapshot_aot_instr").lengthSync();
-      int rodataSize = file("$testDirectory/build/aot/snapshot_aot_rodata").lengthSync();
-      int totalSize = vmisolateSize + isolateSize + instructionsSize + rodataSize;
 
-      Map<String, dynamic> data = <String, dynamic>{
+      Map<String, dynamic> data = new Map<String, dynamic>.fromIterable(
-        'aot_snapshot_build_millis': watch.elapsedMilliseconds,
+        metricExpression.allMatches(buildLog),
-        'aot_snapshot_size_vmisolate': vmisolateSize,
+        key: (Match m) => _sdkNameToMetricName(m.group(1)),
-        'aot_snapshot_size_isolate': isolateSize,
+        value: (Match m) => int.parse(m.group(2)),
-        'aot_snapshot_size_instructions': instructionsSize,
+      );
-        'aot_snapshot_size_rodata': rodataSize,
+      data['aot_snapshot_build_millis'] = watch.elapsedMilliseconds;
-        'aot_snapshot_size_total': totalSize,
+
-      };
+      return new TaskResult.success(data, benchmarkScoreKeys: data.keys.toList());
-      return new TaskResult.success(data, benchmarkScoreKeys: <String>[
-        'aot_snapshot_build_millis',
-        'aot_snapshot_size_vmisolate',
-        'aot_snapshot_size_isolate',
-        'aot_snapshot_size_instructions',
-        'aot_snapshot_size_rodata',
-        'aot_snapshot_size_total',
-      ]);
     });
   }
+
+  static String _sdkNameToMetricName(String sdkName) {
+    const Map<String, String> kSdkNameToMetricNameMapping = const <String, String> {
+      'VMIsolate': 'aot_snapshot_size_vmisolate',
+      'Isolate': 'aot_snapshot_size_isolate',
+      'ReadOnlyData': 'aot_snapshot_size_rodata',
+      'Instructions': 'aot_snapshot_size_instructions',
+      'Total': 'aot_snapshot_size_total',
+    };
+
+    if (!kSdkNameToMetricNameMapping.containsKey(sdkName))
+      throw 'Unrecognized SDK snapshot metric name: $sdkName';
+
+    return kSdkNameToMetricNameMapping[sdkName];
+  }
 }
 
 /// Measure application memory usage.

packages/flutter_tools/lib/src/commands/build_aot.dart

@@ -215,6 +215,7 @@ Future<String> _buildAotSnapshot(
     '--url_mapping=dart:ui,$uiPath',
     '--url_mapping=dart:jni,$jniPath',
     '--url_mapping=dart:vmservice_sky,$vmServicePath',
+    '--print_snapshot_sizes',
   ];
 
   if (!interpreter) {