media.extractor dumpsys to show recent extractors

Bug: 22775369
Change-Id: Ie68484985567896a00d5c193d1853a8f2e3b3964
diff --git a/services/mediaextractor/MediaExtractorService.h b/services/mediaextractor/MediaExtractorService.h
index 9c75042..078af0c 100644
--- a/services/mediaextractor/MediaExtractorService.h
+++ b/services/mediaextractor/MediaExtractorService.h
@@ -34,6 +34,7 @@
     static const char*  getServiceName() { return "media.extractor"; }
 
     virtual sp<IMediaExtractor> makeExtractor(const sp<IDataSource> &source, const char *mime);
+    virtual status_t    dump(int fd, const Vector<String16>& args);
 
     virtual status_t    onTransact(uint32_t code, const Parcel& data, Parcel* reply,
                                 uint32_t flags);