tree 2ba32d089b55460440e05bb5c6f09f94dbc87138
parent bd3f9b67b9a4ba37abfdc95ec8355dab03d98d4e
author Wan-Teh Chang <wtc@google.com> 1541550774 -0800
committer Wan-Teh Chang <wtc@google.com> 1542240768 +0000

Implement aom_once using Win32 InitOnce functions.

On Windows Vista and later, we can use InitOnceBeginInitialize() and
InitOnceComplete() to implement aom_once().

BUG=aomedia:2224

Change-Id: I2f38c7f4386a618df07ab1e765889050f3f666c2