Roll engine to 1bc0e1bb9a8db882a21086096cc2b1e0854312b7 (#16643)

* Roll engine to d6d4eec24c38bb06a9b1aef4e70c321d447ba762

Contains the following engine commits:

flutter/engine@1bc0e1b On windows, refer to Dart snapshot directly executable.
flutter/engine@cf6ca32 Revert "Roll Dart to fe606f890b0a311da802c78b0af414a3c2087a79"
flutter/engine@4b45a53 Only make ERROR and FATAL log levels visible by default.
flutter/engine@98f6c2d Fix shell launcher test (dart2 compliant and stop polling)
flutter/engine@75851f0 Roll Dart to fe606f890b0a311da802c78b0af414a3c2087a79
flutter/engine@9495a52 On iOS, try to use ES3, then fall back to ES2.
flutter/engine@d6d4eec Fix broken Linux build
flutter/engine@d15dc76 Fix broken Chromebot build
flutter/engine@c17a629 Breadcrumbs to the wiki
flutter/engine@4eaf2c2 Return raw (unencoded) bytes in Image.toByteData()
flutter/engine@d812a61 Roll src/third_party/skia/ e669bdfad..276886160 (9 commits)
flutter/engine@62aeab7 Call SkSurface::flush instead of getting a backend handle in vulkan_swapchain.
flutter/engine@f4ebb18 Roll src/third_party/skia/ 3462eb034..e669bdfad (54 commits)
flutter/engine@0b7d6be Re-land "do not pause rendering when android view loses focus"
flutter/engine@91dee59 If the rasterizer has a valid surface context, use that to create a snapshotting render target.
flutter/engine@570231b Specify the packages file path when running engine dart tests.
flutter/engine@0b9cef5 Minor update to README
flutter/engine@c386418 Promote line height in text style created from paragraph style
flutter/engine@4e0fbb6 If the test specifies a .dill file, dont make the engine interpret is as source.
flutter/engine@58e84c8 Re-land "Support multiple shells in a single process.
flutter/engine@37e5df0 Remove only use of SkPaint::kGenA8FromLCD
flutter/engine@b7358b3 libtxt: cache font families that are remapped to the default font family
flutter/engine@a530035 libtxt: fix leaks in Skia object reference counting
flutter/engine@0c74fc9 [fuchsia] Fix use-after-free
flutter/engine@b6d2dde [fuchsia] Fix build
flutter/engine@1dd1264 [async] Adapt to libasync API changes.

* Run test platform finalizers in reverse order to ensure that shell is shutdown before trying to delete any temporary files or directories. This fixes "Access Denied" error on Windows (see #16657).

bin/internal/engine.version

-76cb311d9c33720dcd19274228b39ecdbad8d9af
+1bc0e1bb9a8db882a21086096cc2b1e0854312b7

packages/flutter/test/painting/decoration_test.dart

@@ -4,7 +4,7 @@
 
 import 'dart:async';
 import 'dart:typed_data';
-import 'dart:ui' as ui show EncodingFormat, Image, ColorFilter;
+import 'dart:ui' as ui show Image, ColorFilter;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/painting.dart';
@@ -90,7 +90,7 @@ class TestImage implements ui.Image {
   void dispose() { }
 
   @override
-  Future<ByteData> toByteData({ui.EncodingFormat format}) async {
+  Future<ByteData> toByteData() async {
     throw new UnsupportedError('Cannot encode test image');
   }
 }

packages/flutter/test/painting/image_stream_test.dart

@@ -40,7 +40,7 @@ class FakeImage implements Image {
   void dispose() {}
 
   @override
-  Future<ByteData> toByteData({EncodingFormat format}) async {
+  Future<ByteData> toByteData() async {
     throw new UnsupportedError('Cannot encode test image');
   }
 }

packages/flutter/test/painting/paint_image_test.dart

@@ -23,7 +23,7 @@ class TestImage implements ui.Image {
   void dispose() { }
 
   @override
-  Future<ByteData> toByteData({ui.EncodingFormat format}) async {
+  Future<ByteData> toByteData() async {
     throw new UnsupportedError('Cannot encode test image');
   }
 }

packages/flutter/test/painting/shape_decoration_test.dart

@@ -125,7 +125,7 @@ class TestImage implements ui.Image {
   void dispose() { }
 
   @override
-  Future<ByteData> toByteData({ui.EncodingFormat format}) async {
+  Future<ByteData> toByteData() async {
     throw new UnsupportedError('Cannot encode test image');
   }
 }

packages/flutter/test/rendering/image_test.dart

@@ -4,7 +4,7 @@
 
 import 'dart:async';
 import 'dart:typed_data';
-import 'dart:ui' as ui show EncodingFormat, Image;
+import 'dart:ui' as ui show Image;
 
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -19,7 +19,7 @@ class SquareImage implements ui.Image {
   int get height => 10;
 
   @override
-  Future<ByteData> toByteData({ui.EncodingFormat format}) async {
+  Future<ByteData> toByteData() async {
     throw new UnsupportedError('Cannot encode test image');
   }
 
@@ -38,7 +38,7 @@ class WideImage implements ui.Image {
   int get height => 10;
 
   @override
-  Future<ByteData> toByteData({ui.EncodingFormat format}) async {
+  Future<ByteData> toByteData() async {
     throw new UnsupportedError('Cannot encode test image');
   }
 
@@ -57,7 +57,7 @@ class TallImage implements ui.Image {
   int get height => 20;
 
   @override
-  Future<ByteData> toByteData({ui.EncodingFormat format}) async {
+  Future<ByteData> toByteData() async {
     throw new UnsupportedError('Cannot encode test image');
   }
 

packages/flutter/test/widgets/image_resolution_test.dart

@@ -4,7 +4,7 @@
 
 import 'dart:async';
 import 'dart:typed_data';
-import 'dart:ui' as ui show EncodingFormat, Image;
+import 'dart:ui' as ui show Image;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/rendering.dart';
@@ -26,7 +26,7 @@ class TestImage implements ui.Image {
   void dispose() { }
 
   @override
-  Future<ByteData> toByteData({ui.EncodingFormat format}) async {
+  Future<ByteData> toByteData() async {
     throw new UnsupportedError('Cannot encode test image');
   }
 }

packages/flutter/test/widgets/image_rtl_test.dart

@@ -4,7 +4,7 @@
 
 import 'dart:async';
 import 'dart:typed_data';
-import 'dart:ui' as ui show EncodingFormat, Image;
+import 'dart:ui' as ui show Image;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
@@ -37,7 +37,7 @@ class TestImage implements ui.Image {
   void dispose() { }
 
   @override
-  Future<ByteData> toByteData({ui.EncodingFormat format}) async {
+  Future<ByteData> toByteData() async {
     throw new UnsupportedError('Cannot encode test image');
   }
 }

packages/flutter/test/widgets/image_test.dart

@@ -4,7 +4,7 @@
 
 import 'dart:async';
 import 'dart:typed_data';
-import 'dart:ui' as ui show EncodingFormat, Image;
+import 'dart:ui' as ui show Image;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/rendering.dart';
@@ -484,7 +484,7 @@ class TestImage implements ui.Image {
   void dispose() { }
 
   @override
-  Future<ByteData> toByteData({ui.EncodingFormat format}) async {
+  Future<ByteData> toByteData() async {
     throw new UnsupportedError('Cannot encode test image');
   }
 

packages/flutter_tools/lib/src/test/flutter_platform.dart

@@ -275,7 +275,7 @@ class _FlutterPlatform extends PlatformPlugin {
 
     dynamic outOfBandError; // error that we couldn't send to the harness that we need to send via our future
 
-    final List<_Finalizer> finalizers = <_Finalizer>[];
+    final List<_Finalizer> finalizers = <_Finalizer>[];  // Note: will be run in reverse order.
     bool subprocessActive = false;
     bool controllerSinkClosed = false;
     try {
@@ -511,7 +511,7 @@ class _FlutterPlatform extends PlatformPlugin {
       }
     } finally {
       printTrace('test $ourTestCount: cleaning up...');
-      for (_Finalizer finalizer in finalizers) {
+      for (_Finalizer finalizer in finalizers.reversed) {
         try {
           await finalizer();
         } catch (error, stack) {