VK_USE_PLATFORM_MAGMA_KHR is old and will be removed.

The Vulkan surface extension as used here is meant for testing only.
Since this isn't used, remove it so we don't have to maintain it.
Also remove the attempt to locate all related Vulkan entry points.

Test:
pixelbook:build topaz, launch a spinning cube

This reduces `libflutter.so` by 6 KB (compressed!).

These settings were specific to Dart 1 and are no longer used in the
engine. This eliminates them from the Settings class.

This reverts commit 983d70eb.

flutter/flutter#24402
flutter/flutter#24289
flutter/flutter#24517

Prepend [NSLocale currentLocale] for first locale on iOS to ensure countryCode exists. Allow language-only locales. (#6995)

Since the migration to Dart 2, the first positional command-line
argument to flutter_tester has been a Dart kernel .dill file. Use
Settings::application_kernel_asset here for consistency/clarity.

Pushes the check up front so that we don't always land on the
application_kernel_list_asset error message, which may be misleading to
readers.

Also switches the empty check to only emit in debug builds, since this
is almost certainly not a runtime error but a programmer error.

https://github.com/flutter/flutter/issues/24402
https://github.com/flutter/flutter/issues/24289
https://github.com/flutter/flutter/issues/24391
https://github.com/flutter/flutter/issues/24517
https://github.com/flutter/flutter/issues/23900

Reduces spurious error log messages in GLContextMakeCurrent() attempting
set up the GR context:

  [ERROR:flutter/shell/gpu/gpu_surface_gl.cc(42)] Could not make the context current to setup the gr context.

This picks up fix to Windows toolchain.

Adds a check/error message for the case where running from kernel list,
but application_kernel_list_asset is left unset (or empty).

Adds a check/error message for the case where we fail to load the
application_kernel_list_asset specified in the settings.

This fixes https://github.com/flutter/flutter/issues/24216

Code became obsolete with https://github.com/flutter/engine/pull/3627.

Also fixes mix-in syntax and marks class as private. With the latter the anaylser tells us in the future if there are unused classes in the file.

https://skia.googlesource.com/skia.git/+log/6bdfb6fba352..eb35650f9177


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This reverts commit 9ccd1e86.

https://skia.googlesource.com/skia.git/+log/a63cf8e80aa5..6bdfb6fba352


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https://skia.googlesource.com/skia.git/+log/133944a14f4f..a63cf8e80aa5


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https://skia.googlesource.com/skia.git/+log/f2a7a20b32ad..133944a14f4f


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https://skia.googlesource.com/skia.git/+log/f7376330d11e..f2a7a20b32ad


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https://skia.googlesource.com/skia.git/+log/e7b1a13a1e2a..f7376330d11e


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https://skia.googlesource.com/skia.git/+log/01979132133e..e7b1a13a1e2a


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https://skia.googlesource.com/skia.git/+log/e22505b4f07f..01979132133e


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https://skia.googlesource.com/skia.git/+log/def9bcecd994..e22505b4f07f


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* 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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https://skia.googlesource.com/skia.git/+log/d017e5138c57..66b91e4afb88


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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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https://skia.googlesource.com/skia.git/+log/7e9ea391cfce..1bfdd1adfa22


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