Plumbing maxTouchPoints for Android.

Filled in Android implementation for navigator.maxTouchPoints defined
in the W3C Pointer Events standard draft:
http://www.w3.org/TR/pointerevents/#widl-Navigator-maxTouchPoints

BUG=248918

Review URL: https://codereview.chromium.org/186943002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255553 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed