mf: Add initial async implementation of SetTopology().

include/mfapi.h

@@ -370,6 +370,16 @@ enum _MFT_ENUM_FLAG
     MFT_ENUM_FLAG_UNTRUSTED_STOREMFT              = 0x00000400,
 };
 
+typedef enum
+{
+    MF_TOPOSTATUS_INVALID = 0,
+    MF_TOPOSTATUS_READY = 100,
+    MF_TOPOSTATUS_STARTED_SOURCE = 200,
+    MF_TOPOSTATUS_DYNAMIC_CHANGED = 210,
+    MF_TOPOSTATUS_SINK_SWITCHED = 300,
+    MF_TOPOSTATUS_ENDED = 400,
+} MF_TOPOSTATUS;
+
 HRESULT WINAPI MFAddPeriodicCallback(MFPERIODICCALLBACK callback, IUnknown *context, DWORD *key);
 HRESULT WINAPI MFAllocateWorkQueue(DWORD *queue);
 HRESULT WINAPI MFAllocateWorkQueueEx(MFASYNC_WORKQUEUE_TYPE queue_type, DWORD *queue);