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Google Calendar supports different alert methods for reminders
(e.g. pop-up message or e-mail).  This change adds a UI element
that allows you to select the method for each reminder.

The set of available methods is determined by calendar attributes,
as is the maximum number of reminders.

Bug 4419019

Change-Id: I3f319e21b1919965d4859595f76206b9e96242b8