Add stubs for switch and case output

BUG=angle:921

Change-Id: I58bd645a8d53ef5bad9b680e54c8948d50932fca
Reviewed-on: https://chromium-review.googlesource.com/251525
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Tested-by: Olli Etuaho <oetuaho@nvidia.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
diff --git a/src/compiler/translator/OutputHLSL.cpp b/src/compiler/translator/OutputHLSL.cpp
index 2811a50..876dbb7 100644
--- a/src/compiler/translator/OutputHLSL.cpp
+++ b/src/compiler/translator/OutputHLSL.cpp
@@ -2242,6 +2242,18 @@
     return false;
 }
 
+bool OutputHLSL::visitSwitch(Visit, TIntermSwitch *)
+{
+    UNIMPLEMENTED();
+    return false;
+}
+
+bool OutputHLSL::visitCase(Visit, TIntermCase *)
+{
+    UNIMPLEMENTED();
+    return false;
+}
+
 void OutputHLSL::visitConstantUnion(TIntermConstantUnion *node)
 {
     writeConstantUnion(node->getType(), node->getUnionArrayPointer());