Fix Issue no 3374842. Preview Optimization while switching between two clips.

Change-Id: Iefb55107965b3978f83794fe727405206afdde72
diff --git a/libvideoeditor/lvpp/VideoEditorPreviewController.h b/libvideoeditor/lvpp/VideoEditorPreviewController.h
index d2a5645..2a2a665 100755
--- a/libvideoeditor/lvpp/VideoEditorPreviewController.h
+++ b/libvideoeditor/lvpp/VideoEditorPreviewController.h
@@ -93,6 +93,7 @@
     mutable Mutex mLock;

     M4OSA_Context mThreadContext;

     VePlayerState mPlayerState;

+    M4OSA_Bool    mPrepareReqest;

     M4VSS3GPP_ClipSettings **mClipList; //Pointer to an array of clip settings

     M4OSA_UInt32 mNumberClipsInStoryBoard;

     M4OSA_UInt32 mNumberClipsToPreview;