Migrate liblog to ndk_library.

Test: make native
Bug: http://b/30465923
Change-Id: I3db7ede817a57b3505c0556ea28f08b9e8331e1a
diff --git a/liblog/Android.bp b/liblog/Android.bp
index e32f73c..ba7cc8a 100644
--- a/liblog/Android.bp
+++ b/liblog/Android.bp
@@ -91,3 +91,9 @@
     compile_multilib: "both",
     stl: "none",
 }
+
+ndk_library {
+    name: "liblog.ndk",
+    symbol_file: "liblog.map.txt",
+    first_version: "9",
+}
diff --git a/liblog/liblog.map.txt b/liblog/liblog.map.txt
new file mode 100644
index 0000000..5f19cc1
--- /dev/null
+++ b/liblog/liblog.map.txt
@@ -0,0 +1,14 @@
+LIBLOG {
+  global:
+    __android_log_assert;
+    __android_log_btwrite;
+    __android_log_buf_print; # introduced-arm=21 introduced-arm64=21 introduced-mips=9 introduced-mips64=21 introduced-x86=9 introduced-x86_64=21
+    __android_log_buf_write; # introduced-arm=21 introduced-arm64=21 introduced-mips=9 introduced-mips64=21 introduced-x86=9 introduced-x86_64=21
+    __android_log_bwrite;
+    __android_log_dev_available;
+    __android_log_print;
+    __android_log_vprint;
+    __android_log_write;
+  local:
+    *;
+};