Disable frame dropped log when mix flushing

BZ: 25719

Change LOGW to VTRACE

Change-Id: I5348cd6ec0deda12a769c27b36a1382e2387bf66
Signed-off-by: xiao <fengx.xiao@intel.com>
Reviewed-on: http://android.intel.com:8080/37618
Reviewed-by: Liang, Dan <dan.liang@intel.com>
Reviewed-by: Ding, Haitao <haitao.ding@intel.com>
Tested-by: Ding, Haitao <haitao.ding@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>
diff --git a/videodecoder/VideoDecoderBase.cpp b/videodecoder/VideoDecoderBase.cpp
index 68a83d0..22d32b0 100644
--- a/videodecoder/VideoDecoderBase.cpp
+++ b/videodecoder/VideoDecoderBase.cpp
@@ -642,7 +642,7 @@
 
     if (dropFrame) {
         // we are asked to drop this decoded picture
-        LOGW("Frame dropped");
+        VTRACE("Frame dropped in endDecodingFrame");
         releaseSurfaceBuffer();
         goto exit;
     }