Revert "Revert "Update GNSS Batching to use new GnssLocation with elapsed realtime (HAL)""

This reverts commit b3721a68f273c305ea8e151cd3a8c192605370fc.

Reason for revert: 
It appears that the build includes ag/6721678 but not ag/6762021 even though they both were submitted together. Hence the build errors.

Change-Id: I4e58b29239d291ae3621b90e4507de8eb8838298
diff --git a/gnss/2.0/default/GnssBatching.cpp b/gnss/2.0/default/GnssBatching.cpp
new file mode 100644
index 0000000..d56cdfb
--- /dev/null
+++ b/gnss/2.0/default/GnssBatching.cpp
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+
+#define LOG_TAG "GnssBatching"
+
+#include "GnssBatching.h"
+
+namespace android {
+namespace hardware {
+namespace gnss {
+namespace V2_0 {
+namespace implementation {
+
+sp<V2_0::IGnssBatchingCallback> GnssBatching::sCallback = nullptr;
+
+// Methods from ::android::hardware::gnss::V1_0::IGnssBatching follow.
+Return<bool> GnssBatching::init(const sp<V1_0::IGnssBatchingCallback>&) {
+    // TODO implement
+    return bool{};
+}
+
+Return<uint16_t> GnssBatching::getBatchSize() {
+    // TODO implement
+    return uint16_t{};
+}
+
+Return<bool> GnssBatching::start(const V1_0::IGnssBatching::Options&) {
+    // TODO implement
+    return bool{};
+}
+
+Return<void> GnssBatching::flush() {
+    // TODO implement
+    return Void();
+}
+
+Return<bool> GnssBatching::stop() {
+    // TODO implement
+    return bool{};
+}
+
+Return<void> GnssBatching::cleanup() {
+    // TODO implement
+    return Void();
+}
+
+// Methods from V2_0::IGnssBatching follow.
+Return<bool> GnssBatching::init_2_0(const sp<V2_0::IGnssBatchingCallback>& callback) {
+    sCallback = callback;
+    return true;
+}
+
+}  // namespace implementation
+}  // namespace V2_0
+}  // namespace gnss
+}  // namespace hardware
+}  // namespace android