Omaha allows administrators to control how and when Omaha updates applications. See the announcement on the Open Source Blog. The documentation for administrators is in the Google Update for Enterprise documentation.
Omaha's Group Policy support is implemented by reading the appropriate registry settings from HKLM\Software\Policies\Google\Update when performing specific actions. For example, when determining whether it should do an update check, Omaha attempts to read AutoUpdateCheckPeriodMinutes. If found, that value is used instead of the default value for the comparison with (now - LastChecked).
The Administrative Template is automatically generated for all supported applications by scripts in the enterprise directory.