Migrate liblog to ndk_library.

Test: make native
Bug: http://b/30465923
Change-Id: I3db7ede817a57b3505c0556ea28f08b9e8331e1a

Android.bp

@@ -0,0 +1,22 @@
+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+ndk_headers {
+    name: "liblog_headers",
+    from: "include/android",
+    to: "android",
+    srcs: ["include/android/log.h"],
+}
+
+optional_subdirs = ["*"]

liblog/Android.bp

@@ -91,3 +91,9 @@ cc_library {
     compile_multilib: "both",
     stl: "none",
 }
+
+ndk_library {
+    name: "liblog.ndk",
+    symbol_file: "liblog.map.txt",
+    first_version: "9",
+}

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:
+    *;
+};