Report internal path for public volumes.

Used by framework to bypass FUSE daemon overhead in some cases.

Bug: 21017105
Change-Id: I2f3ae70607417fc4cd2c970cb17cf3afa2f42613
diff --git a/PublicVolume.cpp b/PublicVolume.cpp
index 025d2eb..2b2c32b 100644
--- a/PublicVolume.cpp
+++ b/PublicVolume.cpp
@@ -107,6 +107,7 @@
 
     mRawPath = StringPrintf("/mnt/media_rw/%s", stableName.c_str());
     mFusePath = StringPrintf("/storage/%s", stableName.c_str());
+    setInternalPath(mRawPath);
     setPath(mFusePath);
 
     if (fs_prepare_dir(mRawPath.c_str(), 0700, AID_ROOT, AID_ROOT)) {