Updated shader program caching to account for transform feedback varyings

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 3cf4dda2558c033f029e3e39def522af4bdda370..7cedd0962fba8ae2461abd8c24d43df40f700a57 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -7116,6 +7116,7 @@ void GLES2DecoderImpl::DoTransformFeedbackVaryings(
   if (!program) {
     return;
   }
+  program->TransformFeedbackVaryings(count, varyings, buffer_mode);
   glTransformFeedbackVaryings(
       program->service_id(), count, varyings, buffer_mode);
 }