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/IPackageManagerWrapperImpl.java

@@ -18,6 +18,8 @@ package com.android.settings.applications;
 
 import android.content.Intent;
 import android.content.pm.IPackageManager;
+import android.content.pm.PackageInfo;
+import android.content.pm.ParceledListSlice;
 import android.content.pm.ResolveInfo;
 import android.os.RemoteException;
 
@@ -39,4 +41,27 @@ public class IPackageManagerWrapperImpl implements IPackageManagerWrapper {
             throws RemoteException {
         return mPms.findPersistentPreferredActivity(intent, userId);
     }
+
+    @Override
+    public PackageInfo getPackageInfo(String packageName, int flags, int userId)
+            throws RemoteException {
+        return mPms.getPackageInfo(packageName, flags, userId);
+    }
+
+    @Override
+    public String[] getAppOpPermissionPackages(String permissionName) throws RemoteException {
+        return mPms.getAppOpPermissionPackages(permissionName);
+    }
+
+    @Override
+    public boolean isPackageAvailable(String packageName, int userId) throws RemoteException {
+        return mPms.isPackageAvailable(packageName, userId);
+    }
+
+    @Override
+    public ParceledListSlice<PackageInfo> getPackagesHoldingPermissions(
+        String[] permissions, int flags, int userId) throws RemoteException {
+        return mPms.getPackagesHoldingPermissions(permissions, flags, userId);
+    }
+
 }