Fix unexpected masked action (flutter#37584)

Author: moffatman

shell/platform/android/io/flutter/embedding/android/AndroidTouchProcessor.java

@@ -389,7 +389,7 @@ private int getPointerChangeForAction(int maskedAction) {
     if (maskedAction == MotionEvent.ACTION_SCROLL) {
       return PointerChange.HOVER;
     }
-    throw new AssertionError("Unexpected masked action");
+    return -1;
   }
 
   @PointerChange

shell/platform/android/test/io/flutter/embedding/android/AndroidTouchProcessorTest.java

@@ -3,6 +3,8 @@
 import static junit.framework.TestCase.assertEquals;
 import static org.mockito.Mockito.inOrder;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
 import android.annotation.TargetApi;
@@ -206,4 +208,14 @@ public void mouse() {
     assertEquals(5.0, readPointerPhysicalY(packet));
     inOrder.verifyNoMoreInteractions();
   }
+
+  @Test
+  public void unexpectedMaskedAction() {
+    // Regression test for https://github.com/flutter/flutter/issues/111068
+    MotionEventMocker mocker =
+        new MotionEventMocker(1, InputDevice.SOURCE_STYLUS, MotionEvent.TOOL_TYPE_STYLUS);
+    // ACTION_BUTTON_PRESS is not handled by AndroidTouchProcessor, nothing should be dispatched.
+    touchProcessor.onTouchEvent(mocker.mockEvent(MotionEvent.ACTION_BUTTON_PRESS, 0.0f, 0.0f, 0));
+    verify(mockRenderer, never()).dispatchPointerDataPacket(ByteBuffer.allocate(0), 0);
+  }
 }