update unity package build

src/csharp/build_unitypackage.bat

@@ -40,6 +40,9 @@ xcopy /Y /I nativelibs\csharp_ext_windows_x64\grpc_csharp_ext.dll ..\..\cmake\bu
 
 @rem copy Grpc assemblies to the unity package skeleton
 @rem TODO(jtattermusch): Add Grpc.Auth assembly and its dependencies
+copy /Y Grpc.Core.Api\bin\Release\net45\Grpc.Core.Api.dll unitypackage\unitypackage_skeleton\Plugins\Grpc.Core.Api\lib\net45\Grpc.Core.Api.dll || goto :error
+copy /Y Grpc.Core.Api\bin\Release\net45\Grpc.Core.Api.pdb unitypackage\unitypackage_skeleton\Plugins\Grpc.Core.Api\lib\net45\Grpc.Core.Api.pdb || goto :error
+copy /Y Grpc.Core.Api\bin\Release\net45\Grpc.Core.Api.xml unitypackage\unitypackage_skeleton\Plugins\Grpc.Core.Api\lib\net45\Grpc.Core.Api.xml || goto :error
 copy /Y Grpc.Core\bin\Release\net45\Grpc.Core.dll unitypackage\unitypackage_skeleton\Plugins\Grpc.Core\lib\net45\Grpc.Core.dll || goto :error
 copy /Y Grpc.Core\bin\Release\net45\Grpc.Core.pdb unitypackage\unitypackage_skeleton\Plugins\Grpc.Core\lib\net45\Grpc.Core.pdb || goto :error
 copy /Y Grpc.Core\bin\Release\net45\Grpc.Core.xml unitypackage\unitypackage_skeleton\Plugins\Grpc.Core\lib\net45\Grpc.Core.xml || goto :error

templates/src/csharp/build_unitypackage.bat.template

@@ -42,6 +42,9 @@
   
   @rem copy Grpc assemblies to the unity package skeleton
   @rem TODO(jtattermusch): Add Grpc.Auth assembly and its dependencies
+  copy /Y Grpc.Core.Api\bin\Release\net45\Grpc.Core.Api.dll unitypackage\unitypackage_skeleton\Plugins\Grpc.Core.Api\lib\net45\Grpc.Core.Api.dll || goto :error
+  copy /Y Grpc.Core.Api\bin\Release\net45\Grpc.Core.Api.pdb unitypackage\unitypackage_skeleton\Plugins\Grpc.Core.Api\lib\net45\Grpc.Core.Api.pdb || goto :error
+  copy /Y Grpc.Core.Api\bin\Release\net45\Grpc.Core.Api.xml unitypackage\unitypackage_skeleton\Plugins\Grpc.Core.Api\lib\net45\Grpc.Core.Api.xml || goto :error
   copy /Y Grpc.Core\bin\Release\net45\Grpc.Core.dll unitypackage\unitypackage_skeleton\Plugins\Grpc.Core\lib\net45\Grpc.Core.dll || goto :error
   copy /Y Grpc.Core\bin\Release\net45\Grpc.Core.pdb unitypackage\unitypackage_skeleton\Plugins\Grpc.Core\lib\net45\Grpc.Core.pdb || goto :error
   copy /Y Grpc.Core\bin\Release\net45\Grpc.Core.xml unitypackage\unitypackage_skeleton\Plugins\Grpc.Core\lib\net45\Grpc.Core.xml || goto :error