Make IInputMethodPrivilegedOperations to async (5/N)

-. Remove VoidResultCallback of notifyUserAction.
   and let it be truly asynchronous.
-. Rename this method to notifyUserActionAsync.

Bug: 183587528
Test: atest CtsInputMethodTestCases
Change-Id: I384fd689b6bd1d418ff5208444fbba2c1eac6f85

core/java/android/inputmethodservice/InputMethodService.java

@@ -3313,7 +3313,7 @@ public class InputMethodService extends AbstractInputMethodService {
             if (mNotifyUserActionSent) {
                 return;
             }
-            mPrivOps.notifyUserAction();
+            mPrivOps.notifyUserActionAsync();
             mNotifyUserActionSent = true;
         }
     }

core/java/com/android/internal/inputmethod/IInputMethodPrivilegedOperations.aidl

@@ -43,7 +43,7 @@ oneway interface IInputMethodPrivilegedOperations {
     void switchToPreviousInputMethod(in IBooleanResultCallback resultCallback);
     void switchToNextInputMethod(boolean onlyCurrentIme, in IBooleanResultCallback resultCallback);
     void shouldOfferSwitchingToNextInputMethod(in IBooleanResultCallback resultCallback);
-    void notifyUserAction(in IVoidResultCallback resultCallback);
+    void notifyUserActionAsync();
     void applyImeVisibility(IBinder showOrHideInputToken, boolean setVisible,
             in IVoidResultCallback resultCallback);
 }

core/java/com/android/internal/inputmethod/InputMethodPrivilegedOperations.java

@@ -365,18 +365,16 @@ public final class InputMethodPrivilegedOperations {
     }
 
     /**
-     * Calls {@link IInputMethodPrivilegedOperations#notifyUserAction(IVoidResultCallback)}
+     * Calls {@link IInputMethodPrivilegedOperations#notifyUserActionAsync()}
      */
     @AnyThread
-    public void notifyUserAction() {
+    public void notifyUserActionAsync() {
         final IInputMethodPrivilegedOperations ops = mOps.getAndWarnIfNull();
         if (ops == null) {
             return;
         }
         try {
-            final Completable.Void value = Completable.createVoid();
-            ops.notifyUserAction(ResultCallbacks.of(value));
-            Completable.getResult(value);
+            ops.notifyUserActionAsync();
         } catch (RemoteException e) {
             throw e.rethrowFromSystemServer();
         }

services/core/java/com/android/server/inputmethod/InputMethodManagerService.java

@@ -6069,8 +6069,8 @@ public class InputMethodManagerService extends IInputMethodManager.Stub
 
         @BinderThread
         @Override
-        public void notifyUserAction(IVoidResultCallback resultCallback) {
-            CallbackUtils.onResult(resultCallback, () -> mImms.notifyUserAction(mToken));
+        public void notifyUserActionAsync() {
+            mImms.notifyUserAction(mToken);
         }
 
         @BinderThread