Add option to disable ripples globally

[mwarton]

Bug, feature request, or proposal:

An option to globally disable ripple animations would help to reduce flakiness in screendiff testing.

What is the expected behavior?

Globally diable ripple animations for screen diff testing.

What is the current behavior?

Ripple animations can only be disabled on an element by element basis.

What are the steps to reproduce?

What is the use-case or motivation for changing an existing behavior?

Making screenshot diff tests more reliable.

Which versions of Angular, Material, OS, browsers are affected?

angular/material2

Is there anything else we should know?

[jelbourn]

This should probably be similar to disabling animations globally.

[spock123]

It would be a nice option to have.

Especially on mobile devices, the ripples animations kill anything but the top dog phones.

[M-a-c]

@tinayuangao Seems to be

• Done

feat(ripple): support for global ripple options (#3463)

https://github.com/angular/material2/blob/fb75a136e72489d75c44ca8e68d99352dc71afef/src/lib/core/ripple/ripple.ts#L20

[jelbourn]

So it is.

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