Added handshaker.[ch] to build.yaml.
diff --git a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
index c33c665..bec089e 100644
--- a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
+++ b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
@@ -22,6 +22,9 @@
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\channel\connected_channel.c">
       <Filter>src\core\lib\channel</Filter>
     </ClCompile>
+    <ClCompile Include="$(SolutionDir)\..\src\core\lib\channel\handshaker.c">
+      <Filter>src\core\lib\channel</Filter>
+    </ClCompile>
     <ClCompile Include="$(SolutionDir)\..\src\core\lib\channel\http_client_filter.c">
       <Filter>src\core\lib\channel</Filter>
     </ClCompile>
@@ -578,6 +581,9 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\channel\context.h">
       <Filter>src\core\lib\channel</Filter>
     </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\channel\handshaker.h">
+      <Filter>src\core\lib\channel</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\channel\http_client_filter.h">
       <Filter>src\core\lib\channel</Filter>
     </ClInclude>