[idd] driver: very experimental change to syncronization

This may get reverted, at this point it's an experiment for the
testers to trial.

idd/LGIdd/CFrameBufferResource.h

@@ -14,6 +14,7 @@ class CFrameBufferResource
 {
   private:
     bool                   m_valid;
+    unsigned               m_frameIndex;
     uint8_t              * m_base;
     size_t                 m_size;
     size_t                 m_frameSize;
@@ -21,14 +22,15 @@ class CFrameBufferResource
     void                 * m_map;
 
   public:
-    bool Init(CSwapChainProcessor * swapChain, uint8_t * base, size_t size);
+    bool Init(CSwapChainProcessor * swapChain, unsigned frameIndex, uint8_t * base, size_t size);
     void Reset();
 
-    bool      IsValid()      { return m_valid;     }
-    uint8_t * GetBase()      { return m_base;      }
-    size_t    GetSize()      { return m_size;      }
-    size_t    GetFrameSize() { return m_frameSize; }
-    void *    GetMap()       { return m_map;       }
+    bool      IsValid()       { return m_valid;      }
+    unsigned  GetFrameIndex() { return m_frameIndex; }
+    uint8_t * GetBase()       { return m_base;       }
+    size_t    GetSize()       { return m_size;       }
+    size_t    GetFrameSize()  { return m_frameSize;  }
+    void *    GetMap()        { return m_map;        }
 
     ComPtr<ID3D12Resource> Get() { return m_res; }
 };