android.os.HidlSupport: add getPidIfSharable() for HALs

... that returns PID of the process for debuggable builds.
This calls into the C++ equivalent of the function.

Test: lshal
Bug: 68992575

Change-Id: Ia177c709c6930510035cff33dc2389441a76351d
diff --git a/core/jni/android_os_HidlSupport.cpp b/core/jni/android_os_HidlSupport.cpp
new file mode 100644
index 0000000..e3602d8
--- /dev/null
+++ b/core/jni/android_os_HidlSupport.cpp
@@ -0,0 +1,38 @@
+/*
+ * 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.
+ */
+
+#include <hidl/HidlTransportSupport.h>
+#include <nativehelper/JNIHelp.h>
+
+#include "core_jni_helpers.h"
+
+namespace android {
+static jint android_os_HidlSupport_getPidIfSharable(JNIEnv*, jclass) {
+    return android::hardware::details::getPidIfSharable();
+}
+
+static const JNINativeMethod gHidlSupportMethods[] = {
+    {"getPidIfSharable", "()I", (void*)android_os_HidlSupport_getPidIfSharable},
+};
+
+const char* const kHidlSupportPathName = "android/os/HidlSupport";
+
+int register_android_os_HidlSupport(JNIEnv* env)
+{
+    return RegisterMethodsOrDie(env, kHidlSupportPathName, gHidlSupportMethods, NELEM(gHidlSupportMethods));
+}
+
+}  // namespace android