Set up Gradle build for yogacore

Summary:
I put the CMake file in the root directory to avoid moving the actual `yoga/`
dir around, but created a directory for the Android library manifest nonsense
so it works as its own module you can depend on.

Reviewed By: emilsjolander

Differential Revision: D4913601

fbshipit-source-id: 582064264cf0b6b69c03d0e72ed9dd22d217dd16

CMakeLists.txt

@@ -0,0 +1,17 @@
+#
+# Copyright (c) 2014-present, Facebook, Inc.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree. An additional grant
+# of patent rights can be found in the PATENTS file in the same directory.
+#
+
+cmake_minimum_required(VERSION 3.4.1)
+
+set(CMAKE_VERBOSE_MAKEFILE on)
+
+file(GLOB yogacore_SRC yoga/*.c)
+add_library(yogacore STATIC ${yogacore_SRC})
+
+target_link_libraries(yogacore android log)

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.2'
+        classpath 'com.android.tools.build:gradle:2.3.1'
         classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.7.3'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:1.4.1'
         classpath 'com.nabilhachicha:android-native-dependencies:0.1'

settings.gradle

@@ -1,4 +1,4 @@
-include ':yoga', ':yoga-layout', ':yoga:proguard-annotations', ':libfb'
+include ':yoga', ':yogacore', ':yoga-layout', ':yoga:proguard-annotations', ':libfb'
 project(':yoga').projectDir = file('java')
 project(':yoga:proguard-annotations').projectDir = file('java/proguard-annotations')
 project(':yoga-layout').projectDir = file('android')

yogacore/build.gradle

@@ -0,0 +1,17 @@
+apply plugin: 'com.android.library'
+
+android {
+    compileSdkVersion rootProject.compileSdkVersion
+    buildToolsVersion rootProject.buildToolsVersion
+
+    defaultConfig {
+        minSdkVersion rootProject.minSdkVersion
+        targetSdkVersion rootProject.targetSdkVersion
+    }
+
+    externalNativeBuild {
+        cmake {
+            path '../CMakeLists.txt'
+        }
+    }
+}

yogacore/src/main/AndroidManifest.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  Copyright (c) 2014-present, Facebook, Inc.
+  All rights reserved.
+
+  This source code is licensed under the BSD-style license found in the
+  LICENSE file in the root directory of this source tree. An additional grant
+  of patent rights can be found in the PATENTS file in the same directory.
+-->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+  package="com.facebook.yogacore">
+</manifest>