add number constraint for samples per MotionEvent

Bug:23905002
Change-Id: Ifd24802977c3dcdd1dbc5120a78aac41beae4603

Signed-off-by: Adam Lesinski <adamlesinski@google.com>
diff --git a/include/input/Input.h b/include/input/Input.h
index 4a67f47..92b3d36 100644
--- a/include/input/Input.h
+++ b/include/input/Input.h
@@ -111,6 +111,11 @@
 #define MAX_POINTERS 16
 
 /*
+ * Maximum number of samples supported per motion event.
+ */
+#define MAX_SAMPLES UINT16_MAX
+
+/*
  * Maximum pointer id value supported in a motion event.
  * Smallest pointer id is 0.
  * (This is limited by our use of BitSet32 to track pointer assignments.)