Re-land of skslc switch support

This reverts commit 7d975fc200bbbea991ec4c04c08f3a5ea7b847af.

BUG=skia:

Change-Id: I57521f7a291a35cfed58d623ea4f8da29582d2c5
Reviewed-on: https://skia-review.googlesource.com/8993
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/sksl/ast/SkSLASTStatement.h b/src/sksl/ast/SkSLASTStatement.h
index 9ddde06..6ce320e 100644
--- a/src/sksl/ast/SkSLASTStatement.h
+++ b/src/sksl/ast/SkSLASTStatement.h
@@ -26,6 +26,7 @@
         kFor_Kind,
         kWhile_Kind,
         kDo_Kind,
+        kSwitch_Kind,
         kReturn_Kind,
         kBreak_Kind,
         kContinue_Kind,