Cleanup Return object.

- Expose isOk() instead of having to say getStatus().isOk()
- Add 'get' function which checks to make sure content is valid.
- Mark implicit cast operator as deprecated.

Bug: 32744406
Bug: 31348667
Test: hidl_test
Change-Id: I13bfe33b6c1f9b94a372161064a9e913825df959
diff --git a/base/HidlInternal.cpp b/base/HidlInternal.cpp
new file mode 100644
index 0000000..45afda3
--- /dev/null
+++ b/base/HidlInternal.cpp
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2016 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 "HidlInternal"
+
+#include <hidl/HidlInternal.h>
+
+#include <android-base/logging.h>
+
+namespace android {
+namespace hardware {
+namespace details {
+
+void hidl_log_base::logAlwaysFatal(const char *message) const {
+    LOG(FATAL) << message;
+}
+
+}  // namespace details
+}  // namespace hardware
+}  // namespace android