Use shared app gid for dalvik cache

For forward-locked apps, we need to be able to read the optimized dex
file from a common place. Make it owned by the shared app GID as well.

Bug: 7178231
Change-Id: Ib36d79e8df69d58e8e1e0f167659df995dc84b84

Author: kruton

services/java/com/android/server/pm/PackageManagerService.java

@@ -3535,8 +3535,8 @@ private int performDexOptLI(PackageParser.Package pkg, boolean forceDex, boolean
                         return DEX_OPT_DEFERRED;
                     } else {
                         Log.i(TAG, "Running dexopt on: " + pkg.applicationInfo.packageName);
-                        ret = mInstaller.dexopt(path, pkg.applicationInfo.uid,
-                                !isForwardLocked(pkg));
+                        final int sharedGid = UserHandle.getSharedAppGid(pkg.applicationInfo.uid);
+                        ret = mInstaller.dexopt(path, sharedGid, !isForwardLocked(pkg));
                         pkg.mDidDexOpt = true;
                         performed = true;
                     }