Create libstats_jni

This cl creates libstats_jni, puts the android_util_StatsLog class in it
to implement the jni StatsLog.writeImpl() call, and puts the library in
the statsd apex.

Right now, it does NOT load the library properly and therefore the
library is still in the platform. It needs to be removed from the
platform.

Test: boots
Test: adb shell cmd stats print-logs shows logs still flow
Bug: 147315667
Change-Id: I0a06b66d4640d00ee75bc273423b33dafc944b05
diff --git a/apex/Android.bp b/apex/Android.bp
index 09ca1d2..1f9f18c 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -19,8 +19,9 @@
 }
 
 apex_defaults {
-    // libc.so and libcutils.so are included in the apex
-    // native_shared_libs: ["libc", "libcutils"],
+    native_shared_libs: [
+        "libstats_jni",
+    ],
     // binaries: ["vold"],
     java_libs: [
         "framework-statsd",
@@ -44,3 +45,33 @@
     // com.android.os.statsd.pk8 (the private key)
     certificate: "com.android.os.statsd",
 }
+
+
+// JNI library for StatsLog.write
+cc_library_shared {
+    name: "libstats_jni",
+    srcs: ["jni/**/*.cpp"],
+    shared_libs: [
+        "libnativehelper", // Has stable abi - should not be copied into apex.
+        "liblog",  // Has a stable abi - should not be copied into apex.
+    ],
+    static_libs: [
+        //TODO: make shared - need libstatssocket to also live in the apex.
+        "libstatssocket",
+        "libcutils", // TODO: remove - needed by libstatssocket
+    ],
+    //TODO: is libc++_static correct?
+    stl: "libc++_static",
+    cflags: [
+        "-Wall",
+        "-Werror",
+        "-Wextra",
+        "-Wno-unused-parameter",
+    ],
+    apex_available: [
+        "com.android.os.statsd",
+        "test_com.android.os.statsd",
+        //TODO (b/148620413): remove platform.
+         "//apex_available:platform",
+    ],
+}
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