Fix the shorcuts deletion issue in ShortcutService

Since it cleans up directories and rewrite the ShortcutPackageItems
during saveToXml(), it could lead to shortcuts missing when shutdown.

This CL receives ACTION_SHUTDOWN so that it can finish up saving it
before shutdown if the task is scheduled.

Test: compile & verify basic functions working
Bug: 178191974
Change-Id: If7dece01d6ca5280e6e596317292273246a816e4

services/core/java/com/android/server/pm/ShortcutService.java

@@ -362,6 +362,7 @@ public class ShortcutService extends IShortcutService.Stub {
     private List<Integer> mDirtyUserIds = new ArrayList<>();
 
     private final AtomicBoolean mBootCompleted = new AtomicBoolean();
+    private final AtomicBoolean mShutdown = new AtomicBoolean();
 
     /**
      * Note we use a fine-grained lock for {@link #mUnlockedUsers} due to b/64303666.
@@ -498,6 +499,12 @@ public class ShortcutService extends IShortcutService.Stub {
         mContext.registerReceiverAsUser(mReceiver, UserHandle.ALL,
                 localeFilter, null, mHandler);
 
+        IntentFilter shutdownFilter = new IntentFilter();
+        shutdownFilter.addAction(Intent.ACTION_SHUTDOWN);
+        shutdownFilter.setPriority(IntentFilter.SYSTEM_HIGH_PRIORITY);
+        mContext.registerReceiverAsUser(mShutdownReceiver, UserHandle.SYSTEM,
+                shutdownFilter, null, mHandler);
+
         injectRegisterUidObserver(mUidObserver, ActivityManager.UID_OBSERVER_PROCSTATE
                 | ActivityManager.UID_OBSERVER_GONE);
 
@@ -1162,6 +1169,9 @@ public class ShortcutService extends IShortcutService.Stub {
         if (DEBUG) {
             Slog.d(TAG, "saveDirtyInfo");
         }
+        if (mShutdown.get()) {
+            return;
+        }
         try {
             synchronized (mLock) {
                 for (int i = mDirtyUserIds.size() - 1; i >= 0; i--) {
@@ -3494,6 +3504,22 @@ public class ShortcutService extends IShortcutService.Stub {
         }
     };
 
+    private final BroadcastReceiver mShutdownReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            // Since it cleans up the shortcut directory and rewrite the ShortcutPackageItems
+            // in odrder during saveToXml(), it could lead to shortcuts missing when shutdown.
+            // We need it so that it can finish up saving before shutdown.
+            synchronized (mLock) {
+                if (mHandler.hasCallbacks(mSaveDirtyInfoRunner)) {
+                    mHandler.removeCallbacks(mSaveDirtyInfoRunner);
+                    saveDirtyInfo();
+                }
+                mShutdown.set(true);
+            }
+        }
+    };
+
     /**
      * Called when a user is unlocked.
      * - Check all known packages still exist, and otherwise perform cleanup.