Public StatsLog API for generic mainline logging.

This is a cherry pick to aosp.

Sets up a public api for logging atoms to statsd. The API excepts a
buffer which is already encoded in the proper format for the socket, as
well as the number of bytes of the buffer to write. It performs a JNI
call to perform the socket write. Autogenerated app code will be built
for each mainline module that needs to use this API to log.

Test: builds
Test: existing logs flow properly
Bug: 126134616
Change-Id: I8a9a91e638d730e3ff69cb9345692e49e0db3c96
Merged-In: I8a9a91e638d730e3ff69cb9345692e49e0db3c96
diff --git a/tools/stats_log_api_gen/main.cpp b/tools/stats_log_api_gen/main.cpp
index 73a0fe1..2d9b988 100644
--- a/tools/stats_log_api_gen/main.cpp
+++ b/tools/stats_log_api_gen/main.cpp
@@ -1319,10 +1319,10 @@
     fprintf(out, "\n");
 
     // Print registration function
-    fprintf(out, "int register_android_util_StatsLog(JNIEnv* env) {\n");
+    fprintf(out, "int register_android_util_StatsLogInternal(JNIEnv* env) {\n");
     fprintf(out, "    return RegisterMethodsOrDie(\n");
     fprintf(out, "            env,\n");
-    fprintf(out, "            \"android/util/StatsLog\",\n");
+    fprintf(out, "            \"android/util/StatsLogInternal\",\n");
     fprintf(out, "            gRegisterMethods, NELEM(gRegisterMethods));\n");
     fprintf(out, "}\n");