Add hmac to InputEvent and scale to MotionEvent

We need to pass some additional data to the app to be able to construct
the MotionEvent.

For proper support of getRawX/getRawY, add the xScale and yScale to
MotionEvent.

For the verification of input events, add hmac to InputEvent.

Bug: 134977432
Bug: 140786233
Test: atest libinput_tests inputflinger_tests
Change-Id: Ia3400ebbd9698549aad4d97a3b789ab7e10f6b65
diff --git a/libs/input/KeyCharacterMap.cpp b/libs/input/KeyCharacterMap.cpp
index e189d20..6f9b162 100644
--- a/libs/input/KeyCharacterMap.cpp
+++ b/libs/input/KeyCharacterMap.cpp
@@ -487,9 +487,9 @@
         int32_t deviceId, int32_t keyCode, int32_t metaState, bool down, nsecs_t time) {
     outEvents.push();
     KeyEvent& event = outEvents.editTop();
-    event.initialize(deviceId, AINPUT_SOURCE_KEYBOARD, ADISPLAY_ID_NONE,
-            down ? AKEY_EVENT_ACTION_DOWN : AKEY_EVENT_ACTION_UP,
-            0, keyCode, 0, metaState, 0, time, time);
+    event.initialize(deviceId, AINPUT_SOURCE_KEYBOARD, ADISPLAY_ID_NONE, INVALID_HMAC,
+                     down ? AKEY_EVENT_ACTION_DOWN : AKEY_EVENT_ACTION_UP, 0, keyCode, 0, metaState,
+                     0, time, time);
 }
 
 void KeyCharacterMap::addMetaKeys(Vector<KeyEvent>& outEvents,