Allow changing the mock location returned by GNSS HAL

This CL introduces a new lshal debug command for GNSS HAL
  location [lat=..] [lon=..] [ele=..] that allows changing
the mock location provided by GNSS HAL to clients

This can be used manually to configure a single mock location,
or in a scripted scenario to, e.g., supply a set of locations
from a GPX file to simulate a moving device

Bug: None
Test: set different locations via command line to Cuttlefish device, e.g.
$ adb shell lshal debug android.hardware.gnss@2.1::IGnss/default location lat=46.6317 lon=-114.0789
Change-Id: I7217c59f66f1ee7f5a9bd3f3dd3af7be4b43c024
diff --git a/gnss/common/utils/default/include/MockLocation.h b/gnss/common/utils/default/include/MockLocation.h
new file mode 100644
index 0000000..cd8cb5d
--- /dev/null
+++ b/gnss/common/utils/default/include/MockLocation.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef android_hardware_gnss_common_MockLocation_H_
+#define android_hardware_gnss_common_MockLocation_H_
+
+#include <cstdint>
+
+namespace android {
+namespace hardware {
+namespace gnss {
+namespace common {
+
+extern float gMockLatitudeDegrees;
+extern float gMockLongitudeDegrees;
+extern float gMockAltitudeMeters;
+
+}  // namespace common
+}  // namespace gnss
+}  // namespace hardware
+}  // namespace android
+
+#endif  // android_hardware_gnss_common_MockLocation_H_