adding packages

deprecated/mobile_sidebar/example/windows/scripts/prepare_dependencies.bat

@@ -0,0 +1,35 @@
+:: Copyright 2018 Google LLC
+::
+:: 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.
+@echo off
+
+set INTERMEDIATE_DIR=%~1
+set LOCAL_COPY_DIR=%INTERMEDIATE_DIR%flutter_library\
+set FLUTTER_CACHE_DIR=%FLUTTER_ROOT%\bin\cache\artifacts\engine\windows-x64\
+
+:: Sync the Flutter library, removing previous copies to ensure
+:: that stale files don't stay in the copy.
+call %FLUTTER_ROOT%\bin\flutter precache --windows --no-android --no-ios
+if %errorlevel% neq 0 exit /b %errorlevel%
+echo rmdir /s /q "%LOCAL_COPY_DIR%"
+rmdir /s /q "%LOCAL_COPY_DIR%"
+echo mkdir "%LOCAL_COPY_DIR%"
+mkdir "%LOCAL_COPY_DIR%"
+if %errorlevel% neq 0 exit /b %errorlevel%
+
+xcopy /q /i "%FLUTTER_CACHE_DIR%"flutter_windows.* "%LOCAL_COPY_DIR%"
+if %errorlevel% neq 0 exit /b %errorlevel%
+xcopy /q /i "%FLUTTER_CACHE_DIR%"flutter_*.h "%LOCAL_COPY_DIR%"
+if %errorlevel% neq 0 exit /b %errorlevel%
+xcopy /q /i /s "%FLUTTER_CACHE_DIR%"cpp_client_wrapper "%LOCAL_COPY_DIR%"cpp_client_wrapper
+if %errorlevel% neq 0 exit /b %errorlevel%