Add build scripts

Author: artdeell

build-android.gen.gn

@@ -0,0 +1,7 @@
+target_os = "android"
+target_cpu = "$TARGET_ARCH"
+angle_enable_vulkan = true
+is_component_build = false
+#is_official_build = true
+is_debug = false
+android_ndk_api_level = 26

build.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+git clone --depth 1 https://chromium.googlesource.com/chromium/tools/depot_tools.git
+export PATH=$PWD/depot_tools/:$PATH
+fetch angle
+echo "target_os = ['android']" >> .gclient
+gclient sync
+mkdir out
+mkdir build_out

build_arch.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+mkdir out/Android-$TARGET_ARCH
+mkdir build_out/$ANDROID_TARGET
+envsubst < build-android.gen.gn > out/Android-$TARGET_ARCH/args.gn
+gn gen out/Android-$TARGET_ARCH
+autoninja -C out/Android-$TARGET_ARCH libEGL libGLESv2
+cp out/Android-$TARGET_ARCH/libGLESv2_angle.so build_out/$ANDROID_TARGET/
+cp out/Android-$TARGET_ARCH/libEGL_angle.so build_out/$ANDROID_TARGET/