Adding ApexInfo utility

This is to get name/version when the HAL is started from an APEX. This
is the initial work and just prints name/version on startup.

Bug: 268439003
Test: adb logcat | grep com.google.android.widevine
Change-Id: I756c042d544f973999738f7d17022d916b9712cd

libwvdrmengine/src/service.cpp

@@ -22,11 +22,19 @@
 
 #include "WVCreatePluginFactories.h"
 #include "WVDrmFactory.h"
+#include "widevine_apex_info.h"
 
 using ::wvdrm::hardware::drm::widevine::createDrmFactory;
 using ::wvdrm::hardware::drm::widevine::WVDrmFactory;
 
 int main(int /* argc */, char** /* argv */) {
+#ifdef __ANDROID_APEX__
+  {
+    auto info = widevine::apex::GetApexInfo();
+    CHECK(info.ok()) << info.error();
+    LOG(INFO) << "Starting from " << info->name << "(" << info->version << ")";
+  }
+#endif
   ABinderProcess_setThreadPoolMaxThreadCount(8);
 
   std::shared_ptr<WVDrmFactory> drmFactory = createDrmFactory();