[idd] scheduler: pipeline timing owner deliveries

Allow the timing owner to keep one delivery pending on each independent
owner queue instead of waiting for the client to release every frame.

Count shared fallback deliveries against the same two-frame limit and
match republished frames across all active lanes. This hides the client
release round trip without allowing a third delivery for the owner.

idd/LGIdd/CIndirectDeviceContext.h

@@ -189,9 +189,9 @@ private:
   void ProcessFrameDeliveries();
   int FindAvailableFrameBuffer() const;
   int FindAvailableOwnerQueue(unsigned preferredIndex) const;
-  int FindOwnerDelivery(uint32_t clientID) const;
-  int FindSharedOwnerDelivery(uint32_t clientID) const;
-  bool HasOwnerDelivery(uint32_t clientID) const;
+  unsigned CountOwnerDeliveries(uint32_t clientID) const;
+  bool HasMatchingOwnerDelivery(uint32_t clientID, unsigned frameIndex,
+    uint64_t token) const;
   SharedFramePostResult PostSharedFrame(unsigned frameIndex,
     uint32_t excludeClientID, uint64_t now);
   bool PostSharedOwnerFrame(unsigned frameIndex,