Core API: implementing Renderer requires types from private exports

[platosha]

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[ ] feature request
[ ] support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior
The animate abstract method from the Renderer abstract class is defined using types only available though private exports, namely: AnimationStyles, AnimationKeyframe, AnimationPlayer, NoOpAnimationPlayer.

Expected behavior
All the types to implement animate are public, or the animate is not required in the Renderer.

Minimal reproduction of the problem with instructions

1. Define a TypeScript Angular module.
2. In the module, implement and provide a RootRenderer injectable service with a custom Renderer implemention.
3. TypeScript compiler refuses to compile the Renderer without the animate method. After trying to add it, the issue occurs.

What is the motivation / use case for changing the behavior?
The Renderer is a public API, although experimental. Implementing a Renderer makes low-level DOM adjustments possible, those are sometimes essential to use together with third-party component libraries, such as Polymer.

As for now, a custom Renderer implementation is not achievable without importing the animation types mentioned above from private core exports.

Please tell us about your environment:

• Angular version: 2.3.X

• Browser: all

• Language: TypeScript 2.0.10

[DzmitryShylovich]

AnimationPlayer is exported

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