statsd side implementation of Stats HAL

This change implements server-side of Stats HAL in statsd to be able to
receive loggings and parse them into LogEvent event before passing them to
StatsLogProcessor.

Bug: 114316519
Test: verified that statshal exists by calling 'adb shell lshal'
Change-Id: I43e7415a2d28e20af872049100cd6f2627cf3c02
diff --git a/cmds/statsd/src/main.cpp b/cmds/statsd/src/main.cpp
index 9002f07..a5dac08 100644
--- a/cmds/statsd/src/main.cpp
+++ b/cmds/statsd/src/main.cpp
@@ -25,6 +25,7 @@
 #include <binder/IServiceManager.h>
 #include <binder/ProcessState.h>
 #include <binder/Status.h>
+#include <hidl/HidlTransportSupport.h>
 #include <utils/Looper.h>
 #include <utils/StrongPointer.h>
 
@@ -56,12 +57,21 @@
     ps->giveThreadPoolName();
     IPCThreadState::self()->disableBackgroundScheduling(true);
 
+    ::android::hardware::configureRpcThreadpool(1 /*threads*/, false /*willJoin*/);
+
     // Create the service
     sp<StatsService> service = new StatsService(looper);
     if (defaultServiceManager()->addService(String16("stats"), service) != 0) {
-        ALOGE("Failed to add service");
+        ALOGE("Failed to add service as AIDL service");
         return -1;
     }
+
+    auto ret = service->registerAsService();
+    if (ret != ::android::OK) {
+        ALOGE("Failed to add service as HIDL service");
+        return 1; // or handle error
+    }
+
     service->sayHiToStatsCompanion();
 
     service->Startup();