Clean up external_ui device lab test (#13177)

dev/integration_tests/external_ui/android/app/build.gradle

@@ -23,7 +23,7 @@ android {
     }
 
     defaultConfig {
-        applicationId "com.yourcompany.externalui"
+        applicationId "io.flutter.externalui"
         minSdkVersion 16
         targetSdkVersion 25
         versionCode 1

dev/integration_tests/external_ui/android/app/src/main/AndroidManifest.xml

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.yourcompany.externalui">
+    package="io.flutter.externalui">
 
     <uses-permission android:name="android.permission.INTERNET"/>
 

dev/integration_tests/external_ui/android/app/src/main/java/com/yourcompany/externalui/MainActivity.java → dev/integration_tests/external_ui/android/app/src/main/java/io/flutter/externalui/MainActivity.java

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package com.yourcompany.externalui;
+package io.flutter.externalui;
 
 import android.graphics.Canvas;
 import android.graphics.Paint;

dev/integration_tests/external_ui/ios/Runner.xcodeproj/project.pbxproj

@@ -359,7 +359,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.externalUi;
+				PRODUCT_BUNDLE_IDENTIFIER = io.flutter.externalUi;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Debug;
@@ -381,7 +381,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/Flutter",
 				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.externalUi;
+				PRODUCT_BUNDLE_IDENTIFIER = io.flutter.externalUi;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Release;

dev/integration_tests/external_ui/lib/main.dart

@@ -95,7 +95,9 @@ Widget builds: $_widgetBuilds''';
         ticker.dispose();
         setState(() {
           _flutterFrameRate = tickCount * 1000 / elapsed.inMilliseconds;
-          _summary = 'Flutter frame rate is ${_flutterFrameRate.toStringAsFixed(1)}fps.\nPress play to produce texture frames.';
+          _summary = '''
+Flutter frame rate is ${_flutterFrameRate.toStringAsFixed(1)}fps.
+Press play to produce texture frames.''';
           _icon = Icons.play_arrow;
           _state = FrameState.initial;
         });

dev/integration_tests/external_ui/test_driver/main_test.dart

@@ -16,11 +16,13 @@ Future<Null> main() async {
 
     setUpAll(() async {
       driver = await FlutterDriver.connect();
-      // TODO(mravn): the following pause appears necessary on iOS to avoid
-      // inflating elements too early (when there is no size).
-      await new Future<Null>.delayed(const Duration(seconds: 1));
     });
 
+    // This test verifies that we can consume texture frames at a rate
+    // close to the minimum of the rate at which they are produced
+    // and Flutter's frame rate. It also verifies that we do not rebuild the
+    // Widget tree during texture consumption. The test starts by measuring
+    // Flutter's frame rate.
     test('texture rendering', () async {
       final SerializableFinder fab = find.byValueKey('fab');
       final SerializableFinder summary = find.byValueKey('summary');