Move libjnigraphics to ndk_library.

The headers are already migrated because they're in
frameworks/native/include/android, which was covered when migrating
libandroid.

Test: make native
Bug: http://b/30465923
Change-Id: I610dc6c613f2a408960088a86629073da38682a0

Android.bp

@@ -14,4 +14,5 @@
 
 subdirs = [
     "native/android",
+    "native/graphics/jni",
 ]

native/graphics/jni/Android.bp

@@ -0,0 +1,20 @@
+// 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.
+
+// The headers module is in frameworks/native/Android.bp.
+ndk_library {
+    name: "libjnigraphics.ndk",
+    symbol_file: "libjnigraphics.map.txt",
+    first_version: "9",
+}

native/graphics/jni/libjnigraphics.map.txt

@@ -0,0 +1,8 @@
+LIBJNIGRAPHICS {
+  global:
+    AndroidBitmap_getInfo;
+    AndroidBitmap_lockPixels;
+    AndroidBitmap_unlockPixels;
+  local:
+    *;
+};