Add a snapshot of flutter/engine/src/build to our sdk

build/android/ant/apk-package.xml

Index: build/android/ant/apk-package.xml
diff --git a/build/android/ant/apk-package.xml b/build/android/ant/apk-package.xml
new file mode 100644
index 0000000000000000000000000000000000000000..e8b76f7e453064d56ef3ac2f4c3a3d44be1d7e57
--- /dev/null
+++ b/build/android/ant/apk-package.xml
@@ -0,0 +1,96 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+    Copyright (C) 2005-2008 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.
+-->
+
+<project default="-package">
+  <property name="verbose" value="false" />
+  <property name="out.dir" location="${OUT_DIR}" />
+  <property name="out.absolute.dir" location="${out.dir}" />
+
+  <property name="sdk.dir" location="${ANDROID_SDK_ROOT}"/>
+  <property name="emma.device.jar" location="${EMMA_DEVICE_JAR}" />
+
+  <condition property="emma.enabled" value="true" else="false">
+    <equals arg1="${EMMA_INSTRUMENT}" arg2="1"/>
+  </condition>
+
+  <!-- jar file from where the tasks are loaded -->
+  <path id="android.antlibs">
+    <pathelement path="${sdk.dir}/tools/lib/ant-tasks.jar" />
+  </path>
+
+  <!-- Custom tasks -->
+  <taskdef resource="anttasks.properties" classpathref="android.antlibs" />
+
+  <condition property="build.target" value="release" else="debug">
+    <equals arg1="${CONFIGURATION_NAME}" arg2="Release" />
+  </condition>
+  <condition property="build.is.packaging.debug" value="true" else="false">
+    <equals arg1="${build.target}" arg2="debug" />
+  </condition>
+
+  <!-- Disables automatic signing. -->
+  <property name="build.is.signing.debug" value="false"/>
+
+  <!-- SDK tools assume that out.packaged.file is signed and name it "...-unaligned" -->
+  <property name="out.packaged.file" value="${UNSIGNED_APK_PATH}" />
+
+  <property name="native.libs.absolute.dir" location="${NATIVE_LIBS_DIR}" />
+
+  <!-- Intermediate files -->
+  <property name="resource.package.file.name" value="${RESOURCE_PACKAGED_APK_NAME}" />
+
+  <property name="intermediate.dex.file" location="${DEX_FILE_PATH}" />
+
+  <!-- Macro that enables passing a variable list of external jar files
+       to ApkBuilder. -->
+  <macrodef name="package-helper">
+    <element name="extra-jars" optional="yes" />
+    <sequential>
+      <apkbuilder
+          outfolder="${out.absolute.dir}"
+          resourcefile="${resource.package.file.name}"
+          apkfilepath="${out.packaged.file}"
+          debugpackaging="${build.is.packaging.debug}"
+          debugsigning="${build.is.signing.debug}"
+          verbose="${verbose}"
+          hascode="${HAS_CODE}"
+          previousBuildType="/"
+          buildType="${build.is.packaging.debug}/${build.is.signing.debug}">
+        <dex path="${intermediate.dex.file}"/>
+        <nativefolder path="${native.libs.absolute.dir}" />
+        <extra-jars/>
+      </apkbuilder>
+    </sequential>
+  </macrodef>
+
+
+  <!-- Packages the application. -->
+  <target name="-package">
+    <if condition="${emma.enabled}">
+      <then>
+        <package-helper>
+          <extra-jars>
+            <jarfile path="${emma.device.jar}" />
+          </extra-jars>
+        </package-helper>
+      </then>
+      <else>
+        <package-helper />
+      </else>
+    </if>
+  </target>
+</project>