Switch atlas clients over to using absolute texture coordinates (take 2)

This is a prerequisite for being able to resize the atlas with impunity.

Change-Id: Iccc9c7ced43f38a7d8483a7bd12a458d59a3453a
Reviewed-on: https://skia-review.googlesource.com/38362
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/vk/GrVkVaryingHandler.cpp b/src/gpu/vk/GrVkVaryingHandler.cpp
index 8e43b76..5912098 100644
--- a/src/gpu/vk/GrVkVaryingHandler.cpp
+++ b/src/gpu/vk/GrVkVaryingHandler.cpp
@@ -21,6 +21,8 @@
             return 1;
         case kVec4f_GrSLType:
             return 1;
+        case kVec2us_GrSLType:
+            return 1;
         case kVec2i_GrSLType:
             return 1;
         case kVec3i_GrSLType: