Fixes https://github.com/flutter/flutter/issues/36091.

Previously, a sendRequest will be sent even if the peer is closed during
a driver test. That will cause a time out without any error information.
Such issue is unreproducible on my Mac Book Pro, but 100% reproducible
on our new Mac mini (2018).

The closing issue is tracked in https://github.com/flutter/flutter/issues/36268

Additional to this fix, we should also patch the jason_rpc_2 so the peer
will throw exception if sendRequest is attempted while the connection is
closed.

**Test**:
tiles_scroll_perf_iphonexs__timeline_summary failed without this patch.
It will pass after this patch.

I'm not sure how to add a unit test for this. Please let me know if you have
some ideas.

This patch will generate the following warning log on the new Mac Mini
```
flutter: Observatory listening on http://127.0.0.1:50192/cZPDF4sW7MM=/  
Installing and launching...                                        10.2s
00:00 +0: scrolling performance test (setUpAll)
[info ] FlutterDriver: Connecting to Flutter application at http://127.0.0.1:1069/cZPDF4sW7MM=/
[trace] FlutterDriver: Isolate found with number: 3684677742843303
[trace] FlutterDriver: Isolate is paused at start.
[trace] FlutterDriver: Attempting to resume isolate
[trace] FlutterDriver: Waiting for service extension
[info ] FlutterDriver: Connected to Flutter application.
00:00 +0: scrolling performance test complex_layout_scroll_perf
[warning] FlutterDriver: Instance of '_WebSocketImpl' is closed with an unexpected code 1005
[warning] FlutterDriver: Peer connection is closed! Trying to restore the connection...
00:10 +1: scrolling performance test tiles_scroll_perf
[warning] FlutterDriver: Instance of '_WebSocketImpl' is closed with an unexpected code 1005
[warning] FlutterDriver: Peer connection is closed! Trying to restore the connection...
00:20 +2: scrolling performance test (tearDownAll)
00:20 +2: All tests passed!
Stopping application instance.
```

https://github.com/flutter/engine/compare/3f27c5724c1d...74af88ba9f8b

git log 3f27c5724c1d92c14f8353419dfc6cb40a063aa2..74af88ba9f8bb7437edd128ad0eb1926bd2c1ee4 --no-merges --oneline
74af88ba9 Make the virtual display's window translucent (flutter/engine#9828)
bf91bdb8b Roll src/third_party/skia 563d044c0e76..9d844d8ce5a2 (10 commits) (flutter/engine#9831)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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https://github.com/flutter/engine/compare/76a91d39b4b2...3f27c5724c1d

git log 76a91d39b4b256ef95170ed2d93fccca3c0a0d49..3f27c5724c1d92c14f8353419dfc6cb40a063aa2 --no-merges --oneline
3f27c5724 Roll fuchsia/sdk/core/mac-amd64 from pU_n3ahOhH6HJhE4vs5pUR8cg5U22TItP_Ds_N2OXPIC to qFyiJ56_6XZ5fjNssdCk_vOtBHg4YdWAPNeMIAf07-gC (flutter/engine#9830)
eb4793abf Revert "Roll src/third_party/dart 24725a8559..cbaf890f88 (33 commits) (#9826)" (flutter/engine#9829)
9c54621fd bitcode (flutter/engine#9823)
e105a8982 Roll src/third_party/dart 24725a8559..cbaf890f88 (33 commits) (flutter/engine#9826)
2e83c4a35 Roll fuchsia/sdk/core/linux-amd64 from ehWVT9QJbC-vFMM6SkkQM9HJ9oITFCws7FC9JnrFq2gC to IPgI5Uh4rIZ4zNfAV1_ynC4dGmFLexAW1L9czHUyjowC (flutter/engine#9827)
418fe5b2d Document FontFeature class (flutter/engine#9808)

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https://github.com/flutter/engine/compare/919e3532368f...76a91d39b4b2

git log 919e3532368fa1924614272b8dc88874c603fcff..76a91d39b4b256ef95170ed2d93fccca3c0a0d49 --no-merges --oneline
76a91d39b Roll src/third_party/skia 8590026dbf0d..563d044c0e76 (38 commits) (flutter/engine#9824)
8143845b7 Roll fuchsia/sdk/core/mac-amd64 from olF8ZjlM3lWSmWq8XyfXTKoPveuZtTcrGJINk_ERHhwC to pU_n3ahOhH6HJhE4vs5pUR8cg5U22TItP_Ds_N2OXPIC (flutter/engine#9820)
379028ab6 Add the functionality to merge and unmerge MessageLoopTaskQueues (flutter/engine#9436)
8abe85bb9 Revert "Roll src/third_party/dart 24725a8559..28f95fcd24 (32 commits)" (flutter/engine#9817)
96746bc66 Roll src/third_party/skia c3f28e3cf0d4..8590026dbf0d (2 commits) (flutter/engine#9805)
3652a68eb Roll fuchsia/sdk/core/mac-amd64 from CDbRdGJ3bu-aWMCZqN5VzfQqIBwDGL2wfFodWABKdCIC to olF8ZjlM3lWSmWq8XyfXTKoPveuZtTcrGJINk_ERHhwC (flutter/engine#9803)
67d284d45 Roll src/third_party/dart 24725a8559..28f95fcd24 (32 commits)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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This updates the flutter tool cache to download binary files for ideviceinstaller, ios-deploy, libimobiledevice, and dynamically linked dependencies from Flutter's GCP bucket.

Move tools tests into a general.shard directory in preparation to changing how we shard tools tests (#36108)

https://github.com/flutter/engine/compare/d1dcd1848633...919e3532368f

git log d1dcd1848633c5764e23313823445cbcba451a59..919e3532368fa1924614272b8dc88874c603fcff --no-merges --oneline
919e35323 Only release the image data in the unit-test once Skia has accepted ownership of it. (flutter/engine#9816)
b42450f2b Document //flutter/shell/common/engine. (flutter/engine#9769)
f3edc41e6 Update buildroot to c4df4a7b to pull in MSVC 2017 Update 9 on Windows. (flutter/engine#9799)

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Revert "Merge branches 'master' and 'master' of github.com:flutter/flutter into timsneath-precache2" (#36096)

This reverts commit eb0b1790.
Skia Gold post-submit test were failing due to the service account not being found on Cirrus.

* Fresh PR for Gold integration.

* Nits

* WIP

* Artifacts from merge

* Changed some platform dependencies for web, added library prefix notation for Skia Gold test names.

* Updating for CI implementation

* Write out service account

* Writing to skip out

* WIP

* ++

* Fixing depot tools deps

* Windows depot_tools

* Fixing setup scripts

* ++

* depot tools

* ++

* WIP

* Tracing depot_tools clone

* WIP

* ++

* analyzer

* WIP

* chrome typo

* copy artifact

* Working on tests

* Code cleanup

* ++

* Code cleanup, updated tests

* ++ review feedback

* Review

* Analyzer

* Review feedback

* Nits from review

* PRogress

* ++

* Fixing tests

* ++

* Testing repo route

* Just needing documention around new structures.

* cleanup

* Analyzer

* Documentation updates

* Documentation updates

* Cirrus updates

* cirrus nit

* Review feedback

* Review feedback

* Fixing skip comparator

* Fix base directory for Skia Gold case

* ++

* Feedback

* ++

* Fixed uri assertion

* Made GoldensClient abstract, altered SkiaGoldClient constructor

* Analyzer

This reverts commit 14d489ad.

This updates the flutter tool to cache binary files for ideviceinstaller, ios-deploy, libimobiledevice, and dynamically linked dependencies from Flutter's GCP bucket.

https://github.com/flutter/engine/compare/55a2b81e40bf...d1dcd1848633

git log 55a2b81e40bf91f73a8265b54b73a2d62197d024..d1dcd1848633c5764e23313823445cbcba451a59 --no-merges --oneline
d1dcd1848 Remove breaking asserts (flutter/engine#9797)

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https://github.com/flutter/engine/compare/bcde838d778e...55a2b81e40bf

git log bcde838d778eecd39282cfb84ebba1d484bb7515..55a2b81e40bf91f73a8265b54b73a2d62197d024 --no-merges --oneline
55a2b81e4 Roll src/third_party/skia 7825d4983f90..c3f28e3cf0d4 (9 commits) (flutter/engine#9794)
84fd7eb06 Fix typo in PlaceholderAlignment docs (flutter/engine#9793)
4b11df89d Update flutter_web to latest (flutter/engine#9792)

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https://github.com/flutter/engine/compare/3b944102a56e...bcde838d778e

git log 3b944102a56e8f4182e6601113fc36538edf3de9..bcde838d778eecd39282cfb84ebba1d484bb7515 --no-merges --oneline
bcde838d7 Roll Wuffs and buildroot (flutter/engine#9791)
3b75979d3 fix ColorFilter.matrix constness (flutter/engine#9789)
3c9a22c77 Fall back to a fully qualified path to libapp.so if the library can not be loaded by name (flutter/engine#9762)
298a610c7 Roll fuchsia/sdk/core/mac-amd64 from XOXaWqvr4OuJ6O3uPefSwSFjZMaEmDHy5JQm3Q8Oc0wC to CDbRdGJ3bu-aWMCZqN5VzfQqIBwDGL2wfFodWABKdCIC (flutter/engine#9790)
833f6b4fc Roll src/third_party/skia f9fcf7ffa89a..7825d4983f90 (6 commits) (flutter/engine#9788)
1250c3773 Add comments to differentiate two cache paths (flutter/engine#9721)

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