Added dummy android test application

The application is needed to test Android.mk build.

android_test/Android.mk

@@ -1,2 +1,12 @@
 LOCAL_PATH:= $(call my-dir)
+
+include $(CLEAR_VARS)
+LOCAL_CPP_EXTENSION := .cc .cpp .cxx
+LOCAL_SRC_FILES:=test.cpp
+LOCAL_MODULE:=spirvtools_test
+LOCAL_LDLIBS:=-landroid
+LOCAL_CXXFLAGS:=-std=c++11 -fno-exceptions -fno-rtti -Werror
+LOCAL_STATIC_LIBRARIES=SPIRV-Tools SPIRV-Tools-opt
+include $(BUILD_SHARED_LIBRARY)
+
 include $(LOCAL_PATH)/../Android.mk

android_test/jni/Application.mk

@@ -2,3 +2,4 @@ APP_ABI := all
 APP_BUILD_SCRIPT := Android.mk
 APP_STL := gnustl_static
 APP_PLATFORM := android-9
+NDK_TOOLCHAIN_VERSION := 4.9

android_test/test.cpp

@@ -0,0 +1,22 @@
+// Copyright (c) 2017 Google Inc.
+//
+// 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.
+
+#include <memory>
+#include "spirv-tools/libspirv.hpp"
+#include "spirv-tools/optimizer.hpp"
+
+void android_main(struct android_app* /*state*/) {
+  spvtools::SpirvTools tools(SPV_ENV_UNIVERSAL_1_2);
+  spvtools::Optimizer optimizer(SPV_ENV_UNIVERSAL_1_2);
+}