Move FlutterView and related RPCs to the package:vm_service implementation. Update some getIsolate calls with catchError to match previous behavior.

- Updates tests that were previously mocking FlutterViews to use real views
- Moves the FlutterView cache from VM to FlutterDevice
- Catch SentinelException during Isolate.kill

This reverts commit a18e6361.

* Instead of changing test I just flipped flag so the test uses the proper slider

* Use Depracated annotation

* Updated depracation notice

* Updated depracation notice again

* Ignore analyze issues

* flutter analyze .

* ignore analyzer

* // ignore: deprecated_member_use

* Ignoring notice

* indentation

Support --enable-experiment in flutter test (for flutter_tester). Required minor change for null safety.

This reverts commit 2e50fd75.

Move FlutterView and related RPCs to the package:vm_service implementation. Update some getIsolate calls with catchError to match previous behavior.

- Updates tests that were previously mocking FlutterViews to use real views
- Moves the FlutterView cache from VM to FlutterDevice
- Catch SentinelException during Isolate.kill

This reverts commit 26516817.
Co-authored-by: Kaushik Iska <kaushikiska@google.com>

To avoid spontaneous failures when `catalina-flutter` alias changes.

https://github.com/flutter/engine/compare/2b94311a7764...4f888d66250e

git log 2b94311a7764..4f888d66250e --first-parent --oneline
2020-04-25 nurhan@google.com Change the repo fetch script used in integration tests (flutter/engine#17943)
2020-04-24 skia-flutter-autoroll@skia.org Roll src/third_party/skia 1e21d14f2b8b..c12aad9485a9 (20 commits) (flutter/engine#17942)
2020-04-24 skia-flutter-autoroll@skia.org Roll src/third_party/dart a69cb6d700f5..216e3df4526c (16 commits) (flutter/engine#17945)
2020-04-24 xster@google.com Fix accessibility focus loss when first focusing on text field (flutter/engine#17803)
2020-04-24 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from _dAFU... to G4HpJ... (flutter/engine#17938)
2020-04-24 mouad.debbar@gmail.com [web] Fix exception when getting boxes for rich text range (flutter/engine#17933)
2020-04-24 ferhat@gmail.com [web] Batch systemFontChange messages (flutter/engine#17885)
2020-04-24 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from kpECk... to _dAFU... (flutter/engine#17929)
2020-04-24 skia-flutter-autoroll@skia.org Roll src/third_party/skia b965ff597315..1e21d14f2b8b (25 commits) (flutter/engine#17928)
2020-04-24 skia-flutter-autoroll@skia.org Roll src/third_party/dart 94178e920ee8..a69cb6d700f5 (22 commits) (flutter/engine#17926)

- Update the Linux build to support most of the build configuration, though like windows most only make sense for profile/release.
- Ensure VERBOSE_SCRIPT_LOGGING is set when the logger is verbose
- Automatically run pub get like other build commands

- Update windows precache to include placeholder profile/release artifacts
- Update Linux and windows unpack to account for the cpp_client_wrapper code to live separate from the engine binaries
- Cleanup testing in unpack_linux and remove test cases that are covered in build_system_test.dart

This reverts commit c91a3a74.