Fix for the issue: TestPreviewWithTransition fails (4133108)

Change-Id: I53eb798f4f86e83f8a4668c7256241367c1ccbe4
diff --git a/libvideoeditor/lvpp/PreviewPlayer.h b/libvideoeditor/lvpp/PreviewPlayer.h
old mode 100644
new mode 100755
index 0800115..b3a32bc
--- a/libvideoeditor/lvpp/PreviewPlayer.h
+++ b/libvideoeditor/lvpp/PreviewPlayer.h
@@ -68,6 +68,8 @@
 
     status_t suspend();
     status_t resume();
+    void acquireLock();
+    void releaseLock();
 
     status_t prepare();
     status_t setDataSource(
@@ -202,6 +204,7 @@
     bool mIsFiftiesEffectStarted;
     int64_t mImageFrameTimeUs;
     bool mStartNextPlayer;
+    mutable Mutex mLockControl;
 
     M4VIFI_UInt8*  mFrameRGBBuffer;
     M4VIFI_UInt8*  mFrameYUVBuffer;