Pinned apk file should be put in mPinnedFiles.

The apk file which was pinned should be add to the mPinnedFiles,
if not, the unpinApp can not found the PinnedFile from mPinnedFiles,
will not do the unpinFile for the pinned apk file.

Change-Id: I74f30650a590e746de2a98e8f9c5535ee2a9d37e

services/core/java/com/android/server/PinnerService.java

@@ -885,6 +885,7 @@ public final class PinnerService extends SystemService {
             }
             synchronized (this) {
                 pinnedApp.mFiles.add(pf);
+                mPinnedFiles.put(pf.fileName, pf);
             }
 
             apkPinSizeLimit -= pf.bytesPinned;
@@ -1356,18 +1357,6 @@ public final class PinnerService extends SystemService {
 
     public List<PinnedFileStat> getPinnerStats() {
         ArrayList<PinnedFileStat> stats = new ArrayList<>();
-        Collection<PinnedApp> pinnedApps;
-        synchronized(this) {
-            pinnedApps = mPinnedApps.values();
-        }
-        for (PinnedApp pinnedApp : pinnedApps) {
-            for (PinnedFile pf : pinnedApp.mFiles) {
-                PinnedFileStat stat =
-                        new PinnedFileStat(pf.fileName, pf.bytesPinned, pf.groupName);
-                stats.add(stat);
-            }
-        }
-
         Collection<PinnedFile> pinnedFiles;
         synchronized(this) {
             pinnedFiles = mPinnedFiles.values();