Add Dvorak keyboard layout.

Added support for mapping both scan codes and HID usages to
KeyLayoutMap and KeyCharacterMap.  Keyboard overlays can
now influence how key events are mapped to key codes.

Bug: 6110399
Change-Id: I6619fd2d3e1337c55928f89869dbc45b535c7ccf
diff --git a/services/input/EventHub.h b/services/input/EventHub.h
index f885f4d..afc12ef 100644
--- a/services/input/EventHub.h
+++ b/services/input/EventHub.h
@@ -335,6 +335,13 @@
         void close();
 
         inline bool isVirtual() const { return fd < 0; }
+
+        const sp<KeyCharacterMap>& getKeyCharacterMap() const {
+            if (combinedKeyMap != NULL) {
+                return combinedKeyMap;
+            }
+            return keyMap.keyCharacterMap;
+        }
     };
 
     status_t openDeviceLocked(const char *devicePath);