Backport missing permission check for querying main activity intent

- This was fixed in T in ag/16820166, but the original code was
  submitted in S.  This ensures that the caller of this method
  is either holding the ACCESS_SHORTCUTS permission or is the
  default launcher.

Bug: 229256049
Test: atest WMShellUnitTests

Change-Id: Ib233ad754a6c6e3c4e0d0e10ed788ab8e055cccc
Merged-In: Ib233ad754a6c6e3c4e0d0e10ed788ab8e055cccc
(cherry picked from commit f4ed441e18)

core/java/android/content/pm/ILauncherApps.aidl

@@ -56,8 +56,8 @@ interface ILauncherApps {
     void startActivityAsUser(in IApplicationThread caller, String callingPackage,
             String callingFeatureId, in ComponentName component, in Rect sourceBounds,
             in Bundle opts, in UserHandle user);
-    PendingIntent getActivityLaunchIntent(in ComponentName component, in Bundle opts,
-            in UserHandle user);
+    PendingIntent getActivityLaunchIntent(String callingPackage, in ComponentName component,
+            in Bundle opts, in UserHandle user);
     void showAppDetailsAsUser(in IApplicationThread caller, String callingPackage,
             String callingFeatureId, in ComponentName component, in Rect sourceBounds,
             in Bundle opts, in UserHandle user);

core/java/android/content/pm/LauncherApps.java

@@ -752,7 +752,8 @@ public class LauncherApps {
         }
         try {
             // due to b/209607104, startActivityOptions will be ignored
-            return mService.getActivityLaunchIntent(component, null /* opts */, user);
+            return mService.getActivityLaunchIntent(mContext.getPackageName(), component,
+                    null /* opts */, user);
         } catch (RemoteException re) {
             throw re.rethrowFromSystemServer();
         }

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

@@ -1098,8 +1098,9 @@ public class LauncherAppsService extends SystemService {
         }
 
         @Override
-        public PendingIntent getActivityLaunchIntent(ComponentName component, Bundle opts,
-                UserHandle user) {
+        public PendingIntent getActivityLaunchIntent(String callingPackage, ComponentName component,
+                Bundle opts, UserHandle user) {
+            ensureShortcutPermission(callingPackage);
             if (!canAccessProfile(user.getIdentifier(), "Cannot start activity")) {
                 throw new ActivityNotFoundException("Activity could not be found");
             }