Add vulkan files into skia repo.

src/gpu/vk/GrVkVaryingHandler.cpp

Index: src/gpu/vk/GrVkVaryingHandler.cpp
diff --git a/src/gpu/vk/GrVkVaryingHandler.cpp b/src/gpu/vk/GrVkVaryingHandler.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..c923f6684cb2f40466fa70aa7234639f093c04d9
--- /dev/null
+++ b/src/gpu/vk/GrVkVaryingHandler.cpp
@@ -0,0 +1,26 @@
+/*
+* Copyright 2016 Google Inc.
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+
+#include "GrVkVaryingHandler.h"
+
+
+void finalize_helper(GrVkVaryingHandler::VarArray& vars) {
+    for (int i = 0; i < vars.count(); ++i) {
+        SkString location;
+        location.appendf("location = %d", i);
+        vars[i].setLayoutQualifier(location.c_str());
+    }
+}
+
+void GrVkVaryingHandler::onFinalize() {
+    finalize_helper(fVertexInputs);
+    finalize_helper(fVertexOutputs);
+    finalize_helper(fGeomInputs);
+    finalize_helper(fGeomOutputs);
+    finalize_helper(fFragInputs);
+    finalize_helper(fFragOutputs);
+}