limit mediaserver memory

Limit mediaserver using rlimit, to prevent it from bringing down the system
via the low memory killer.
Default max is 65% of total RAM, but can be customized via system property.

Bug: 28471206
Bug: 28615448
Change-Id: Ic84137435d1ef0a6883e9789a4b4f399e4283f05
diff --git a/media/libmedia/Android.mk b/media/libmedia/Android.mk
index a3c3d3c..9f836f0 100644
--- a/media/libmedia/Android.mk
+++ b/media/libmedia/Android.mk
@@ -44,6 +44,7 @@
     IResourceManagerService.cpp \
     IStreamSource.cpp \
     MediaCodecInfo.cpp \
+    MediaUtils.cpp \
     Metadata.cpp \
     mediarecorder.cpp \
     IMediaMetadataRetriever.cpp \