Add pinch classification and scale factor axis

Bug: 251196347
Test: check events received by a custom tester app, and touches shown by
      pointer location overlay
Test: atest inputflinger_tests
Change-Id: I0cb7ade63139ab35025ff1e12609e2b411b1f5f8
diff --git a/native/android/input.cpp b/native/android/input.cpp
index 5e5ebed..f1c3088 100644
--- a/native/android/input.cpp
+++ b/native/android/input.cpp
@@ -299,6 +299,8 @@
             return AMOTION_EVENT_CLASSIFICATION_TWO_FINGER_SWIPE;
         case android::MotionClassification::MULTI_FINGER_SWIPE:
             return AMOTION_EVENT_CLASSIFICATION_MULTI_FINGER_SWIPE;
+        case android::MotionClassification::PINCH:
+            return AMOTION_EVENT_CLASSIFICATION_PINCH;
     }
 }