Add PPB_Alarms_Dev interface definition.

The C++ wrapper will be in a separate CL.

BUG=327197,233439
TEST=None

Review URL: https://codereview.chromium.org/103993006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240013 0039d316-1c4b-4281-b951-d872f2087c98
15 files changed