MediaProvider: Avoid issue of android.process.media stop

"OK" and "Cancel" button's click event response at the same time
lead to FATAL EXCEPTION. Make the click events do not happen at
the same time.

Change-Id: I92fc1dc15be42d0bd9fe54f41fdbb26b3ca4b85c
CRs-Fixed: 513752
MediaProvider: Add feature to support group music by folder path

There is no support to group music by folder path.

Add extra query sql statement for supporting group music
by folder path.

CRs-Fixed: 620983

Change-Id: If0036efe8c9ebbea11c7aca1752e1d12b2287955
MediaProvider: support streaming bookmark

Add bookmarks table and bookmark URI.

CRs-Fixed: 637282
Change-Id: I4414a1619066efe58457350a82394d56d26d41bb