Properly dispose of Composed Flip events without inframe events
Properly dispose of Composed Flip events without inframe events

Signed-off-by: Zuoming Shi <f5bab476b06898c5ad9868d5aeb5eabf1618c591@microsoft.com>

GameTechDev/PresentMon,GameTechDev/PresentMon,GameTechDev/PresentMon,GameTechDev/PresentMon