reuse CCDecoder on video discontinuity

bug: 19266084
Change-Id: I06ef57b09b048a85f77be4dee27599c4f60aacc9
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayer.cpp b/media/libmediaplayerservice/nuplayer/NuPlayer.cpp
index e02a2d5..3b472a2 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayer.cpp
+++ b/media/libmediaplayerservice/nuplayer/NuPlayer.cpp
@@ -1185,7 +1185,9 @@
         CHECK(format->findString("mime", &mime));
 
         sp<AMessage> ccNotify = new AMessage(kWhatClosedCaptionNotify, id());
-        mCCDecoder = new CCDecoder(ccNotify);
+        if (mCCDecoder == NULL) {
+            mCCDecoder = new CCDecoder(ccNotify);
+        }
 
         if (mSourceFlags & Source::FLAG_SECURE) {
             format->setInt32("secure", true);