Add a C-api for retrieving display info.

As HWUI will need to depend on ABI-stable interfaces moving forward, we
need such an interface against SurfaceComposer for retrieving display
metadata.

This CL won't contain a map file to stabilize the ABI yet, as I expect
that there will be some flux due to refresh rate apis.

Bug: 136263392
Test: builds
Change-Id: I7227e2e72789d36a21534840eac88817135251c3
diff --git a/libs/nativedisplay/Android.bp b/libs/nativedisplay/Android.bp
new file mode 100644
index 0000000..66ebdfd
--- /dev/null
+++ b/libs/nativedisplay/Android.bp
@@ -0,0 +1,50 @@
+// Copyright 2019 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.
+
+cc_library_headers {
+    name: "libnativedisplay_headers",
+    export_include_dirs: ["include"],
+}
+
+cc_library {
+    name: "libnativedisplay",
+    export_include_dirs: [
+        "include",
+    ],
+
+    clang: true,
+
+    cflags: [
+        "-Wall",
+        "-Werror",
+        "-Wno-enum-compare",
+        "-Wno-unused-function",
+    ],
+
+    srcs: [
+        "ADisplay.cpp",
+    ],
+
+    shared_libs: [
+        "libgui",
+        "liblog",
+        "libui",
+        "libutils",
+    ],
+
+    header_libs: [
+        "libnativedisplay_headers",
+    ],
+
+}