stagefright/media: add support for codec features with text value

Bug: 11990470
Change-Id: I7600d999c5f4b6821d825d25fa7e8a2bb5a80c46
diff --git a/media/libmedia/MediaCodecInfo.cpp b/media/libmedia/MediaCodecInfo.cpp
index 446c582..7b4c4e2 100644
--- a/media/libmedia/MediaCodecInfo.cpp
+++ b/media/libmedia/MediaCodecInfo.cpp
@@ -257,4 +257,10 @@
     mCurrentCaps->mDetails->setInt32(tag.c_str(), value);
 }
 
+void MediaCodecInfo::addFeature(const AString &key, const char *value) {
+    AString tag = "feature-";
+    tag.append(key);
+    mCurrentCaps->mDetails->setString(tag.c_str(), value);
+}
+
 }  // namespace android