Handle non-split pointers for multi-device case

During multi-device event stream, tempTouchState will already contain
some pointers from another case. When the second device becomes active
and tries to add pointers to a non-splitting window, we should not be
marking that pointer as going to the second window unless it's already
receiving pointers for that device.

Fixes: 341869464
Flag: EXEMPT bugfix
Test: TEST=inputflinger_tests; m $TEST && $ANDROID_HOST_OUT/nativetest64/$TEST/$TEST
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:962044645a27baaaf9d7736f76c6c252aa82c419)
Merged-In: Ia295c1d9d941383792e90a3d6fd981473af8f015
Change-Id: Ia295c1d9d941383792e90a3d6fd981473af8f015
diff --git a/services/inputflinger/tests/FakeWindows.h b/services/inputflinger/tests/FakeWindows.h
index ee65d3a..3a3238a 100644
--- a/services/inputflinger/tests/FakeWindows.h
+++ b/services/inputflinger/tests/FakeWindows.h
@@ -304,6 +304,13 @@
                                           WithFlags(expectedFlags)));
     }
 
+    inline void consumeMotionPointerDown(int32_t pointerIdx,
+                                         const ::testing::Matcher<MotionEvent>& matcher) {
+        const int32_t action = AMOTION_EVENT_ACTION_POINTER_DOWN |
+                (pointerIdx << AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT);
+        consumeMotionEvent(testing::AllOf(WithMotionAction(action), matcher));
+    }
+
     inline void consumeMotionPointerUp(int32_t pointerIdx,
                                        const ::testing::Matcher<MotionEvent>& matcher) {
         const int32_t action = AMOTION_EVENT_ACTION_POINTER_UP |