MediaPlayer: enable more logs for extractor failure.

Test: compiles
Bug: 37273297
Change-Id: I53c6393e0c306c64ec4aa81c45e5ff6e8de233d8
diff --git a/media/libmediaplayerservice/nuplayer/GenericSource.cpp b/media/libmediaplayerservice/nuplayer/GenericSource.cpp
index aedca3f..ba45b98 100644
--- a/media/libmediaplayerservice/nuplayer/GenericSource.cpp
+++ b/media/libmediaplayerservice/nuplayer/GenericSource.cpp
@@ -156,6 +156,7 @@
     extractor = MediaExtractor::Create(mDataSource, NULL);
 
     if (extractor == NULL) {
+        ALOGE("initFromDataSource, cannot create extractor!");
         return UNKNOWN_ERROR;
     }
 
@@ -171,6 +172,7 @@
 
     size_t numtracks = extractor->countTracks();
     if (numtracks == 0) {
+        ALOGE("initFromDataSource, source has no track!");
         return UNKNOWN_ERROR;
     }