[WIP] Using UIViewPropertyAnimator for keyboard animation presentationLayer tracking.

[luckysmg]

Preview

0CCA6D58-233E-4786-81EB-3D21A63AC196.MP4

Frame by frame preview

CE3F8433-FFC0-4F6A-8F49-679465EC998D.MP4

Pre-launch Checklist

• I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• I read the [Tree Hygiene] wiki page, which explains my responsibilities.
• I read and followed the [Flutter Style Guide] and the [C++, Objective-C, Java style guides].
• I listed at least one issue that this PR fixes in the description above.
• I added new tests to check the change I am making or feature I am adding, or Hixie said the PR is test-exempt. See [testing the engine] for instructions on writing and running engine tests.
• I updated/added relevant documentation (doc comments with ///).
• I signed the [CLA].
• All existing and new tests are passing.

[luckysmg]

Close since this patch will not solve the random jitter issue. Needs more investigation.