reduce e2e test matrix

Author: yjbanov

lib/web_ui/dev/integration_tests_manager.dart

@@ -240,21 +240,23 @@ class IntegrationTestsManager {
   }
 
   Set<String> _getBuildModes() {
-    Set<String> buildModes;
-    if (_buildModeSelected) {
-      final String mode = IntegrationTestsArgumentParser.instance.buildMode;
-      if (mode == 'debug' && _browser != 'chrome') {
-        throw ToolException('Debug mode is only supported for Chrome.');
-      } else {
-        buildModes = <String>{mode};
-      }
-    } else {
-      // TODO(nurhan): Enable `release` when recipe is sharded.
-      buildModes = _browser == 'chrome'
-          ? {'debug', 'profile'}
-          : {'profile'};
-    }
-    return buildModes;
+    // TODO(yjbanov): reenable all modes when sharding is available.
+    return <String>{'profile'};
+    // Set<String> buildModes;
+    // if (_buildModeSelected) {
+    //   final String mode = IntegrationTestsArgumentParser.instance.buildMode;
+    //   if (mode == 'debug' && _browser != 'chrome') {
+    //     throw ToolException('Debug mode is only supported for Chrome.');
+    //   } else {
+    //     buildModes = <String>{mode};
+    //   }
+    // } else {
+    //   // TODO(nurhan): Enable `release` when recipe is sharded.
+    //   buildModes = _browser == 'chrome'
+    //       ? {'debug', 'profile'}
+    //       : {'profile'};
+    // }
+    // return buildModes;
   }
 
   /// Validate the directory has a `pubspec.yaml` file and a `test_driver`