flutter/flutter#62143

[fuchsia] fix and re-enable SessionConnection unittests

This change waits until Scenic is initialized before beginning the test
logic. This should fix the issue where the test starts running before or
during Scenic startup.

* Prevent crash when restore is called after picture recording ends
* Addressed reviewer comments

This reverts commit 8825f917 because it breaks flutter_gallery__back_button_memory and a customer test.

* [web] Fix arc scaling when counter clockwise
* update golden write
* Removed unused var

Refactors instantiateImageCodec and decodeImageFromPixels to provide intermediate data about the image width, height, and bytes per pixel. This allows for more fine grained control from Dart, particularly when trying to reason about how or whether to maintain aspect ratio in the targetWidth/targetHeight parameters.

This leaves the existing methods functional by re-implementing them to use the new ImmutableBuffer/ImageDescriptor class.

The ImmutableBuffer class is provided so that callers can avoid copying the image data multiple times if they wish to re-recreate the image descriptor.

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