feat(button): Add support for increased touch target to button.

[joyzhong]

No description provided.

[codecov-io]

Codecov Report

Merging #4948 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #4948   +/-   ##
========================================
  Coverage    98.69%   98.69%           
========================================
  Files          122      122           
  Lines         5983     5983           
  Branches       790      790           
========================================
  Hits          5905     5905           
  Misses          77       77           
  Partials         1        1

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[mdc-web-bot]

🤖 Beep boop!

Screenshot test report 🚦

16 screenshots changed from master on commit 67468c3:

• https://storage.googleapis.com/mdc-web-screenshot-tests/travis/2019/07/24/20_54_58_815/report/report.html?utm_source=github&utm_medium=pr_comment

Details

16 Changed:

• spec/mdc-chips/classes/input.html

• spec/mdc-dialog/classes/overflow-accessible-font-size.html

• spec/mdc-dialog/classes/overflow-bottom.html

• spec/mdc-dialog/classes/overflow-top.html

• spec/mdc-dialog/mixins/max-height.html

• spec/mdc-dialog/mixins/max-width.html

[mdc-web-bot]

🤖 Beep boop!

Screenshot test report 🚦

16 screenshots changed from master on commit 349ef4d:

• https://storage.googleapis.com/mdc-web-screenshot-tests/travis/2019/07/24/21_02_33_475/report/report.html?utm_source=github&utm_medium=pr_comment

Details

16 Changed:

• spec/mdc-chips/classes/input.html

• spec/mdc-dialog/classes/overflow-accessible-font-size.html

• spec/mdc-dialog/classes/overflow-bottom.html

• spec/mdc-dialog/classes/overflow-top.html

• spec/mdc-dialog/mixins/max-height.html

• spec/mdc-dialog/mixins/max-width.html

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[mdc-web-bot]

All 708 screenshot tests passed for commit 54ec7cb vs. develop! 💯🎉

[abhiomkar]

LGTM, minor comment.

[abhiomkar]

nit: it is just 48px height for this component.

[joyzhong]

Buttons will always have at least 48px width since we add 24px padding-left/right, so this is still valid. Going to keep this to be consistent with Material spec, to avoid any confusion.