Fix safe mode and KeyEvent.getMaxKeyCode().

Bug: 2901731
Change-Id: I78617c1b9dee3790fc590e5af4b5083368873184

core/java/android/view/KeyEvent.java

@@ -156,7 +156,7 @@ public class KeyEvent extends InputEvent implements Parcelable {
     //  those new codes.  This is intended to maintain a consistent
     //  set of key code definitions across all Android devices.
    
-    private static final int LAST_KEYCODE           = KEYCODE_SWITCH_CHARSET;
+    private static final int LAST_KEYCODE           = KEYCODE_BUTTON_MODE;
     
     /**
      * @deprecated There are now more than MAX_KEYCODE keycodes.

include/ui/InputReader.h

@@ -454,6 +454,8 @@ public:
     virtual void reset();
     virtual void process(const RawEvent* rawEvent);
 
+    virtual int32_t getScanCodeState(uint32_t sourceMask, int32_t scanCode);
+
 private:
     // Amount that trackball needs to move in order to generate a key event.
     static const int32_t TRACKBALL_MOVEMENT_THRESHOLD = 6;

libs/ui/InputReader.cpp

@@ -1080,6 +1080,14 @@ void TrackballInputMapper::applyPolicyAndDispatch(nsecs_t when, int32_t motionEv
             1, & pointerId, pointerCoords, mXPrecision, mYPrecision, downTime);
 }
 
+int32_t TrackballInputMapper::getScanCodeState(uint32_t sourceMask, int32_t scanCode) {
+    if (scanCode >= BTN_MOUSE && scanCode < BTN_JOYSTICK) {
+        return getEventHub()->getScanCodeState(getDeviceId(), scanCode);
+    } else {
+        return AKEY_STATE_UNKNOWN;
+    }
+}
+
 
 // --- TouchInputMapper ---