MTP and media provider support for multiple storage devices:

- MTP support for multiple storage units

- Add storage_id column to media database for MTP storage ID

- Add framework resource for defining mount points and user visible descriptions
for multiple volumes

- Clean up locking in MtpServer JNI code

Change-Id: Iffb66ed156ef5bc80b14228af78fbacee7734360
diff --git a/media/mtp/MtpServer.h b/media/mtp/MtpServer.h
index 1efa715..fa729a8 100644
--- a/media/mtp/MtpServer.h
+++ b/media/mtp/MtpServer.h
@@ -70,6 +70,9 @@
                                     int fileGroup, int filePerm, int directoryPerm);
     virtual             ~MtpServer();
 
+    MtpStorage*         getStorage(MtpStorageID id);
+    inline bool         hasStorage() { return mStorages.size() > 0; }
+    bool                hasStorage(MtpStorageID id);
     void                addStorage(MtpStorage* storage);
     void                removeStorage(MtpStorage* storage);
 
@@ -79,9 +82,6 @@
     void                sendObjectRemoved(MtpObjectHandle handle);
 
 private:
-    MtpStorage*         getStorage(MtpStorageID id);
-    inline bool         hasStorage() { return mStorages.size() > 0; }
-    bool                hasStorage(MtpStorageID id);
     void                sendStoreAdded(MtpStorageID id);
     void                sendStoreRemoved(MtpStorageID id);
     void                sendEvent(MtpEventCode code, uint32_t param1);