Add ButtonCompat: a Material-styled button on all versions of Android.

Add ButtonCompat: a Material-styled button on all versions of Android.

This adds a new widget, ButtonCompat, which is a Material-styled button.
On pre-L devices, the widget approximates the Material style, but
doesn't have ripples or shadows. The color of ButtonCompat can be easily
changed using setButtonColor().

This also adds a style ButtomBorderlessCompat than can be applied to
Buttons to make them look like borderless Material buttons.

BUG=442690
Committed: https://crrev.com/e66bc5de9f4ca9a6f3c0a46547fdaf496cbb3ce6
Cr-Commit-Position: refs/heads/master@{#314942}

[newt (away), 2015-02-06 01:07:28]

newt@chromium.org changed reviewers:
+ aurimas@chromium.org

[newt (away), 2015-02-06 01:07:28]

PTAL

[aurimas (slooooooooow), 2015-02-06 01:16:42]

lgtm

https://codereview.chromium.org/902893004/diff/20001/chrome/android/java/src/...
File
chrome/android/java/src/org/chromium/chrome/browser/widget/ButtonCompat.java
(right):

https://codereview.chromium.org/902893004/diff/20001/chrome/android/java/src/...
chrome/android/java/src/org/chromium/chrome/browser/widget/ButtonCompat.java:33:
*       app:buttonColor="#f00" />
s/app/chrome

[newt (away), 2015-02-06 01:17:30]

New patchsets have been uploaded after l-g-t-m from aurimas@chromium.org

[newt (away), 2015-02-06 01:17:39]

The CQ bit was checked by newt@chromium.org

[commit-bot: I haz the power, 2015-02-06 01:18:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/902893004/40001

[commit-bot: I haz the power, 2015-02-06 01:45:34]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-02-06 01:47:29]

Patchset 3 (id:??) landed as
https://crrev.com/e66bc5de9f4ca9a6f3c0a46547fdaf496cbb3ce6
Cr-Commit-Position: refs/heads/master@{#314942}