Yarden Eitan 90938fe59f
[Dialogs] Adds the Ripple behavior to Dialogs. (#7595)
## Related links
* Bug: Closes #7379 
* Ripple: [Ripple](https://github.com/material-components/material-components-ios/tree/develop/components/Ripple)

## Introduction
This PR allows enabling the Ripple Behavior for [`MDCAlertController and MDCAlertControllerView`](https://github.com/material-components/material-components-ios/tree/develop/components/Dialogs) by enabling the ripple behavior of the internal `MDCButton`. This behavior is an opt in flag property added to MDCAlertController, `enableRippleBehavior`.  This improves the visual touch feedback for our users as MDCInkView didn't support our current motion guidelines.

## Videos
| Before | After |
| - | - |
|![oldRipple](https://user-images.githubusercontent.com/4066863/59470021-81c9a500-8e04-11e9-8071-cdc2d3a81ceb.gif)|![newRipple](https://user-images.githubusercontent.com/4066863/59470027-85f5c280-8e04-11e9-834b-a180c8805e40.gif)|
2019-06-15 12:47:00 -04:00
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