BG-FGS-Launch uses the same grace period mechanism as BG-Activity-Launch.

WindowProcessController.areBackgroundActivityStartsAllowed() has the 10 seconds grace period,
starts from last activity's launch time or finish time.

Expose this method as an ATMS interface for AMS to call, to determine if
BG-FGS-Launch is allowed.

Bug: 171305836
Test: atest cts/tests/app/src/android/app/cts/ActivityManagerFgsBgStartTest.java
Change-Id: I30706dc1950bf5d49926a8e26c0493d9e168eb1b

services/core/java/com/android/server/am/ActiveServices.java

@@ -169,6 +169,7 @@ public final class ActiveServices {
     public static final int FGS_FEATURE_ALLOWED_BY_DEVICE_DEMO_MODE = 18;
     public static final int FGS_FEATURE_ALLOWED_BY_PROCESS_RECORD = 19;
     public static final int FGS_FEATURE_ALLOWED_BY_EXEMPTED_PACKAGES = 20;
+    public static final int FGS_FEATURE_ALLOWED_BY_ACTIVITY_STARTER = 21;
 
     @IntDef(flag = true, prefix = { "FGS_FEATURE_" }, value = {
             FGS_FEATURE_DENIED,
@@ -191,6 +192,7 @@ public final class ActiveServices {
             FGS_FEATURE_ALLOWED_BY_DEVICE_DEMO_MODE,
             FGS_FEATURE_ALLOWED_BY_PROCESS_RECORD,
             FGS_FEATURE_ALLOWED_BY_EXEMPTED_PACKAGES,
+            FGS_FEATURE_ALLOWED_BY_ACTIVITY_STARTER
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface FgsFeatureRetCode {}
@@ -5202,8 +5204,8 @@ public final class ActiveServices {
             for (int i = mAm.mProcessList.mLruProcesses.size() - 1; i >= 0; i--) {
                 final ProcessRecord pr = mAm.mProcessList.mLruProcesses.get(i);
                 if (pr.uid == callingUid) {
-                    if (pr.areBackgroundActivityStartsAllowedByToken()) {
-                        ret = FGS_FEATURE_ALLOWED_BY_ACTIVITY_TOKEN;
+                    if (pr.getWindowProcessController().areBackgroundActivityStartsAllowed()) {
+                        ret = FGS_FEATURE_ALLOWED_BY_ACTIVITY_STARTER;
                         break;
                     }
                 }
@@ -5406,6 +5408,8 @@ public final class ActiveServices {
                 return "ALLOWED_BY_PROCESS_RECORD";
             case FGS_FEATURE_ALLOWED_BY_EXEMPTED_PACKAGES:
                 return "FGS_FEATURE_ALLOWED_BY_EXEMPTED_PACKAGES";
+            case FGS_FEATURE_ALLOWED_BY_ACTIVITY_STARTER:
+                return "ALLOWED_BY_ACTIVITY_STARTER";
             default:
                 return "";
         }

services/core/java/com/android/server/am/ProcessRecord.java

@@ -1381,10 +1381,6 @@ class ProcessRecord implements WindowProcessListener {
         mWindowProcessController.removeAllowBackgroundActivityStartsToken(entity);
     }
 
-    boolean areBackgroundActivityStartsAllowedByToken() {
-        return mWindowProcessController.areBackgroundActivityStartsAllowedByToken();
-    }
-
     void addBoundClientUid(int clientUid) {
         mBoundClientUids.add(clientUid);
         mWindowProcessController.setBoundClientUids(mBoundClientUids);

services/core/java/com/android/server/wm/WindowProcessController.java

@@ -510,13 +510,9 @@ public class WindowProcessController extends ConfigurationContainer<Configuratio
         }
     }
 
-    /**
-     * Returns true if background activity starts are allowed by any token added via {@link
-     * #addOrUpdateAllowBackgroundActivityStartsToken(Binder, IBinder)}.
-     */
-    public boolean areBackgroundActivityStartsAllowedByToken() {
+    public boolean areBackgroundActivityStartsAllowed() {
         synchronized (mAtm.mGlobalLock) {
-            return !mBackgroundActivityStartTokens.isEmpty();
+            return areBackgroundActivityStartsAllowed(mAtm.getBalAppSwitchesAllowed());
         }
     }