separate the JNI part of the NDK into their own source

Test: built and booted device
Bug: 35164655
Change-Id: I944c9f28730b82e8c428b5384dc57e1b296144b2
diff --git a/native/android/hardware_buffer_jni.cpp b/native/android/hardware_buffer_jni.cpp
new file mode 100644
index 0000000..06b0782
--- /dev/null
+++ b/native/android/hardware_buffer_jni.cpp
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2017 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 "AHardwareBuffer"
+
+#include <android/hardware_buffer_jni.h>
+
+#include <android_runtime/android_hardware_HardwareBuffer.h>
+
+using namespace android;
+
+AHardwareBuffer* AHardwareBuffer_fromHardwareBuffer(JNIEnv* env, jobject hardwareBufferObj) {
+    return android_hardware_HardwareBuffer_getNativeHardwareBuffer(env, hardwareBufferObj);
+}
+
+jobject AHardwareBuffer_toHardwareBuffer(JNIEnv* env, AHardwareBuffer* hardwareBuffer) {
+    return android_hardware_HardwareBuffer_createFromAHardwareBuffer(env, hardwareBuffer);
+}