Two fixes on autofill save.

1.Fixed race condition on save request - if the service was unbound, it would
  mark the RemoteFillService as completed and the retry would be dropped.
2.Removed session when save request is canceled.

Change-Id: Ib71514cdcfecc38c07dd7656174d0db68ed758d1
Fixes: 36001206
Test: CtsAutoFillServiceTestCases pass

services/autofill/java/com/android/server/autofill/AutoFillManagerServiceImpl.java

@@ -728,6 +728,14 @@ final class AutoFillManagerServiceImpl {
                     .sendToTarget();
         }
 
+        // AutoFillUiCallback
+        @Override
+        public void cancelSave() {
+            mHandlerCaller.getHandler().post(() -> {
+                removeSelf();
+            });
+        }
+
         // AutoFillUiCallback
         @Override
         public void onEvent(AutoFillId id, int event) {

services/autofill/java/com/android/server/autofill/RemoteFillService.java

@@ -182,11 +182,8 @@ final class RemoteFillService implements DeathRecipient {
         if (mDestroyed || mCompleted) {
             return;
         }
-        if (pendingRequest.isFinal()) {
-            mCompleted = true;
-        }
         if (!isBound()) {
-            if (mPendingRequest != null) {
+            if (mPendingRequest != null && mPendingRequest != pendingRequest) {
                 mPendingRequest.cancel();
             }
             mPendingRequest = pendingRequest;
@@ -196,6 +193,9 @@ final class RemoteFillService implements DeathRecipient {
                 Slog.d(LOG_TAG, "[user: " + mUserId + "] handlePendingRequest()");
             }
             pendingRequest.run();
+            if (pendingRequest.isFinal()) {
+                mCompleted = true;
+            }
         }
     }
 

services/autofill/java/com/android/server/autofill/ui/AutoFillUI.java

@@ -65,6 +65,7 @@ public final class AutoFillUI {
         void authenticate(@NonNull IntentSender intent);
         void fill(@NonNull Dataset dataset);
         void save();
+        void cancelSave();
         void onEvent(AutoFillId id, int event);
     }
 
@@ -220,6 +221,9 @@ public final class AutoFillUI {
                                     + listener, e);
                         }
                     }
+                    if (mCallback != null) {
+                        mCallback.cancelSave();
+                    }
                 }
             }, mSaveTimeoutMs);
         });