Add API to get KeyCode produced by physical key location.

The physical key location is provided as a location KeyCode pointing to a location on a US keyboard layout.

Bug: 179812917
Test: atest KeyboardLayoutChangeTest
Test: atest android.hardware.input.cts.tests -m
Test: atest inputflinger_tests -m
Change-Id: Ib5ed41890cbbe393ee9ada1a04cbaaf82c9bb1fc
diff --git a/services/inputflinger/reader/mapper/KeyboardInputMapper.cpp b/services/inputflinger/reader/mapper/KeyboardInputMapper.cpp
index a8602a4..1d63c0e 100644
--- a/services/inputflinger/reader/mapper/KeyboardInputMapper.cpp
+++ b/services/inputflinger/reader/mapper/KeyboardInputMapper.cpp
@@ -95,7 +95,7 @@
 
 KeyboardInputMapper::~KeyboardInputMapper() {}
 
-uint32_t KeyboardInputMapper::getSources() {
+uint32_t KeyboardInputMapper::getSources() const {
     return mSource;
 }
 
@@ -375,6 +375,10 @@
     return getDeviceContext().getScanCodeState(scanCode);
 }
 
+int32_t KeyboardInputMapper::getKeyCodeForKeyLocation(int32_t locationKeyCode) const {
+    return getDeviceContext().getKeyCodeForKeyLocation(locationKeyCode);
+}
+
 bool KeyboardInputMapper::markSupportedKeyCodes(uint32_t sourceMask, size_t numCodes,
                                                 const int32_t* keyCodes, uint8_t* outFlags) {
     return getDeviceContext().markSupportedKeyCodes(numCodes, keyCodes, outFlags);