Add vulkan files into skia repo.

src/gpu/vk/GrVkUtil.h

Index: src/gpu/vk/GrVkUtil.h
diff --git a/src/gpu/vk/GrVkUtil.h b/src/gpu/vk/GrVkUtil.h
new file mode 100644
index 0000000000000000000000000000000000000000..4fee31046d4560ce6ecac53b81388c255f5c0bff
--- /dev/null
+++ b/src/gpu/vk/GrVkUtil.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrVkUtil_DEFINED
+#define GrVkUtil_DEFINED
+
+#include "GrColor.h"
+#include "GrTypes.h"
+#include "vk/GrVkInterface.h"
+
+#include "vulkan/vulkan.h"
+
+// makes a Vk call on the interface
+#define GR_VK_CALL(IFACE, X) (IFACE)->fFunctions.f##X;
+// same as GR_VK_CALL but checks for success
+#ifdef SK_DEBUG
+#define GR_VK_CALL_ERRCHECK(IFACE, X) \
+    VkResult SK_MACRO_APPEND_LINE(ret) = GR_VK_CALL(IFACE, X); \
+    SkASSERT(VK_SUCCESS == SK_MACRO_APPEND_LINE(ret));
+#else
+#define GR_VK_CALL_ERRCHECK(IFACE, X)  (void) GR_VK_CALL(IFACE, X);
+#endif
+
+/**
+ * Returns the vulkan texture format for the given GrPixelConfig
+ */
+bool GrPixelConfigToVkFormat(GrPixelConfig config, VkFormat* format);
+
+bool GrSampleCountToVkSampleCount(uint32_t samples, VkSampleCountFlagBits* vkSamples);
+
+#endif
+