Fix crash when primary user select app installed by secondary user.

- PackageManager.getPackageInfo() can return null. When trying to check
the app permission info, check for null package info and only process
the permission info when package info is available.
- Update usage of PackageManager.MATCH_UNINSTALLED_PACKAGES to
PackageManager.MATCH_ANY_USER, as the implementation for querying
packages for other users have been changed.
- Add PackageManager APIs used by AppStateAppOpsBridge to
IPackageManagerWrapper for test purpose.
- Change UserManager.get() to Context.getSystemService() to fix test
failure.

Change-Id: I52de924618aa252ffaae02b8f06ebe5b1d0def61
Fix: 37409266
Test: make RunSettingsRoboTests

src/com/android/settings/applications/IPackageManagerWrapper.java

@@ -17,6 +17,8 @@
 package com.android.settings.applications;
 
 import android.content.Intent;
+import android.content.pm.PackageInfo;
+import android.content.pm.ParceledListSlice;
 import android.content.pm.ResolveInfo;
 import android.os.RemoteException;
 
@@ -41,4 +43,33 @@ public interface IPackageManagerWrapper {
      * @see android.content.pm.IPackageManager#findPersistentPreferredActivity
      */
     ResolveInfo findPersistentPreferredActivity(Intent intent, int userId) throws RemoteException;
+
+    /**
+     * Calls {@code IPackageManager.getPackageInfo()}.
+     *
+     * @see android.content.pm.IPackageManager#getPackageInfo
+     */
+    PackageInfo getPackageInfo(String packageName, int flags, int userId) throws RemoteException;
+
+    /**
+     * Calls {@code IPackageManager.getAppOpPermissionPackages()}.
+     *
+     * @see android.content.pm.IPackageManager#getAppOpPermissionPackages
+     */
+    String[] getAppOpPermissionPackages(String permissionName) throws RemoteException;
+
+    /**
+     * Calls {@code IPackageManager.isPackageAvailable()}.
+     *
+     * @see android.content.pm.IPackageManager#isPackageAvailable
+     */
+    boolean isPackageAvailable(String packageName, int userId) throws RemoteException;
+
+    /**
+     * Calls {@code IPackageManager.getPackagesHoldingPermissions()}.
+     *
+     * @see android.content.pm.IPackageManager#getPackagesHoldingPermissions
+     */
+    ParceledListSlice<PackageInfo> getPackagesHoldingPermissions(
+        String[] permissions, int flags, int userId) throws RemoteException;
 }