Send "compilation" tag when inserting into the database.

It's not actually inserted into the database, but the media provider uses it
for disambiguating albums.
b/3311831

Change-Id: Idb630866e960338ce2795dcc128cafaf6c9c27f2

Author: marcone

media/java/android/media/MediaScanner.java

@@ -402,6 +402,7 @@ private class MyMediaScannerClient implements MediaScannerClient {
         private long mLastModified;
         private long mFileSize;
         private String mWriter;
+        private int mCompilation;
 
         public FileCacheEntry beginFile(String path, String mimeType, long lastModified, long fileSize) {
 
@@ -486,6 +487,7 @@ public FileCacheEntry beginFile(String path, String mimeType, long lastModified,
             mPath = path;
             mLastModified = lastModified;
             mWriter = null;
+            mCompilation = 0;
 
             return entry;
         }
@@ -596,6 +598,8 @@ public void handleStringTag(String name, String value) {
                 mDuration = parseSubstring(value, 0, 0);
             } else if (name.equalsIgnoreCase("writer") || name.startsWith("writer;")) {
                 mWriter = value.trim();
+            } else if (name.equalsIgnoreCase("compilation")) {
+                mCompilation = parseSubstring(value, 0, 0);
             }
         }
 
@@ -646,6 +650,7 @@ private ContentValues toValues() {
                 }
                 map.put(Audio.Media.TRACK, mTrack);
                 map.put(Audio.Media.DURATION, mDuration);
+                map.put(Audio.Media.COMPILATION, mCompilation);
             }
             return map;
         }