* Use weak references instead of resurrection, if available

Co-authored-by: NDavid Iglesias <ditman@gmail.com>

* WIP on using TypefaceFontProvider

* Support pushPaintStyle

getGrContext is going away, plus we already have the fully-powered-up GrDirectContext available and we previously weren't using it.

This reverts commit 12a37478.

* fix ios layout change cause the accessibility focus to jump randomly.

* format

* addressing review comments

* Migrate a few last places to GrDirectContext

This is a followup to #19962 to cover a few places where we
were still using GrContext. No functional impact.

* Formatting

Refactors the Windows embedding internals to make an engine object that
owns things associated with the engine rather than the view, and updates
the API surface to allow using the engine directly.

This is an incremental step toward both a cleaner, non-struct-based
internal structure and a finalized API surface.