Enable Device Motion on Android by default.

This CL:
- enables Device Motion by default on the Android platform.
- adds a disable-device-motion flag.

BUG=135804

Review URL: https://chromiumcodereview.appspot.com/21591002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@215215 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed