Add integer vectors to GrSLType

BUG=skia:

Change-Id: I4a4a50e214f2240d83f6f0b02cf43e695c067933
Reviewed-on: https://skia-review.googlesource.com/8122
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
diff --git a/src/gpu/vk/GrVkVaryingHandler.cpp b/src/gpu/vk/GrVkVaryingHandler.cpp
index d7d08c9..d936e2b 100644
--- a/src/gpu/vk/GrVkVaryingHandler.cpp
+++ b/src/gpu/vk/GrVkVaryingHandler.cpp
@@ -21,6 +21,12 @@
             return 1;
         case kVec4f_GrSLType:
             return 1;
+        case kVec2i_GrSLType:
+            return 1;
+        case kVec3i_GrSLType:
+            return 1;
+        case kVec4i_GrSLType:
+            return 1;
         case kMat22f_GrSLType:
             return 2;
         case kMat33f_GrSLType: