* Revert "Revert "Guard the service protocol's global handlers list with a reader/writer lock (#6888) #6895" (#6899)"

This reverts commit b6e93759 and applies fix for tests on Windows.

* Reland guard the service protocol's global handlers list with a reader/writer lock.

* Remove blank line

Revert "Guard the service protocol's global handlers list with a reader/writer lock (#6888) #6895" (#6899)

https://skia.googlesource.com/skia.git/+log/66b91e4afb88..def9bcecd994


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The service protocol holds the lock while waiting for completion of service
RPC tasks.  These tasks (specifically hot restart/RunInView) may need to
modify a handler's description data.

Task execution and ServiceProtocol::SetHandlerDescription will obtain a shared
lock to make this possible.  AddHandler and RemoveHandler will obtain an
exclusive lock in order to guard against a handler being deleted while a
service task is running.

https://skia.googlesource.com/skia.git/+log/1bfdd1adfa22..d017e5138c57


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Revert "Guard the service protocol's global handlers list with a reader/writer lock (#6888)" (#6893)

This reverts commit 9352360c.

(shared_timed_mutex is unavailable in the iOS build)

https://skia.googlesource.com/skia.git/+log/73b4a1f57254..7e9ea391cfce


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The service protocol holds the lock while waiting for completion of service
RPC tasks.  These tasks (specifically hot restart/RunInView) may need to
modify a handler's description data.

Task execution and ServiceProtocol::SetHandlerDescription will obtain a shared
lock to make this possible.  AddHandler and RemoveHandler will obtain an
exclusive lock in order to guard against a handler being deleted while a
service task is running.

https://skia.googlesource.com/skia.git/+log/7fb30f11a055..73b4a1f57254


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Keep a copy of each engine's description that can be accessed outside the engine's UI thread (#6885)

The service protocol's ListViews method needs to return description data for
each engine in the process.  Previously ListViews would queue a task to each
UI thread to gather this data.  However, the UI thread might be blocked from
executing tasks (e.g. if the Dart isolate is paused), resulting in a deadlock.

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ServiceProtocol's global list of engines, allowing ListViews to run without
accessing any UI threads.

Fixes https://github.com/flutter/flutter/issues/24400

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These target are no longer built or referenced in either the Flutter or
Fuchsia buildroots. Similar examples are present in the examples/ directory
in the framework.

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Check for software rendering modes that do not have a GrContext

These sneaked in between https://github.com/flutter/engine/pull/6757 and https://github.com/flutter/engine/pull/6759.

This reverts commit 2c6be93f.

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* Don't allow for creation of CallbackHandle objects for anonymous closures. Fixes issue #22310

Fixes flutter/flutter#24058
Reopens flutter/flutter#14028

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Fixes https://github.com/flutter/flutter/issues/24160

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