track debug build times; switch from --profile to --release

dev/devicelab/lib/tasks/perf_tests.dart

@@ -177,6 +177,8 @@ class PerfTest {
   }
 }
 
+/// Measures how long it takes to build a Flutter app and how big the compiled
+/// code is.
 class BuildTest {
 
   BuildTest(this.testDirectory);
@@ -189,27 +191,58 @@ class BuildTest {
       await device.unlock();
       await flutter('packages', options: <String>['get']);
 
+      final Map<String, dynamic> aotResults = await _buildAot();
+      final Map<String, dynamic> debugResults = await _buildDebug();
+
+      final Map<String, dynamic> metrics = <String, dynamic>{}
+        ..addAll(aotResults)
+        ..addAll(debugResults);
+
+      return new TaskResult.success(metrics, benchmarkScoreKeys: metrics.keys.toList());
+    });
+  }
+
+  static Future<Map<String, dynamic>> _buildAot() async {
+    await flutter('build', options: <String>['clean']);
     final Stopwatch watch = new Stopwatch()..start();
     final String buildLog = await evalFlutter('build', options: <String>[
       'aot',
       '-v',
-        '--profile',
+      '--release',
       '--no-pub',
       '--target-platform', 'android-arm'  // Generate blobs instead of assembly.
     ]);
     watch.stop();
 
     final RegExp metricExpression = new RegExp(r'([a-zA-Z]+)\(CodeSize\)\: (\d+)');
-
-      final Map<String, dynamic> data = new Map<String, dynamic>.fromIterable(
+    final Map<String, dynamic> metrics = new Map<String, dynamic>.fromIterable(
       metricExpression.allMatches(buildLog),
       key: (Match m) => _sdkNameToMetricName(m.group(1)),
       value: (Match m) => int.parse(m.group(2)),
     );
-      data['aot_snapshot_build_millis'] = watch.elapsedMilliseconds;
+    metrics['aot_snapshot_build_millis'] = watch.elapsedMilliseconds;
 
-      return new TaskResult.success(data, benchmarkScoreKeys: data.keys.toList());
-    });
+    return metrics;
+  }
+
+  static Future<Map<String, dynamic>> _buildDebug() async {
+    await flutter('build', options: <String>['clean']);
+
+    final Stopwatch watch = new Stopwatch();
+    if (deviceOperatingSystem == DeviceOperatingSystem.ios) {
+      await prepareProvisioningCertificates(cwd);
+      watch.start();
+      await flutter('build', options: <String>['ios', '--debug']);
+      watch.stop();
+    } else {
+      watch.start();
+      await flutter('build', options: <String>['apk', '--debug']);
+      watch.stop();
+    }
+
+    return <String, dynamic>{
+      'debug_full_build_millis': watch.elapsedMilliseconds,
+    };
   }
 
   static String _sdkNameToMetricName(String sdkName) {