Add vulkan files into skia repo.

src/gpu/vk/GrVkVaryingHandler.h

Index: src/gpu/vk/GrVkVaryingHandler.h
diff --git a/src/gpu/vk/GrVkVaryingHandler.h b/src/gpu/vk/GrVkVaryingHandler.h
new file mode 100644
index 0000000000000000000000000000000000000000..d47194149e5d05be21f02084f5c5b8d03a370bd6
--- /dev/null
+++ b/src/gpu/vk/GrVkVaryingHandler.h
@@ -0,0 +1,27 @@
+/*
+* Copyright 2016 Google Inc.
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+
+#ifndef GrVkVaryingHandler_DEFINED
+#define GrVkVaryingHandler_DEFINED
+
+#include "glsl/GrGLSLVarying.h"
+
+class GrVkVaryingHandler : public GrGLSLVaryingHandler {
+public:
+    GrVkVaryingHandler(GrGLSLProgramBuilder* program) : INHERITED(program) {}
+
+    typedef GrGLSLVaryingHandler::VarArray VarArray;
+
+private:
+    void onFinalize() override;
+
+    friend class GrVkProgramBuilder;
+
+    typedef GrGLSLVaryingHandler INHERITED;
+};
+
+#endif