Add vulkan files into skia repo.

src/gpu/vk/GrVkImageView.cpp

+/*
+* 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 "GrVkImageView.h"
+#include "GrVkGpu.h"
+#include "GrVkUtil.h"
+
+const GrVkImageView* GrVkImageView::Create(GrVkGpu* gpu, VkImage image, VkFormat format,
+                                           Type viewType) {
+    VkImageView imageView;
+    
+    // Create the VkImageView
+    VkImageViewCreateInfo viewInfo = {
+        VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,               // sType
+        NULL,                                                   // pNext
+        0,                                                      // flags
+        image,                                                  // image
+        VK_IMAGE_VIEW_TYPE_2D,                                  // viewType
+        format,                                                 // format
+        { VK_COMPONENT_SWIZZLE_R, VK_COMPONENT_SWIZZLE_G,
+          VK_COMPONENT_SWIZZLE_B, VK_COMPONENT_SWIZZLE_A },     // components
+        { VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1 },              // subresourceRange
+    };
+    if (kStencil_Type == viewType) {
+        viewInfo.components.r = VK_COMPONENT_SWIZZLE_ZERO;
+        viewInfo.components.g = VK_COMPONENT_SWIZZLE_ZERO;
+        viewInfo.components.b = VK_COMPONENT_SWIZZLE_ZERO;
+        viewInfo.components.a = VK_COMPONENT_SWIZZLE_ZERO;
+        viewInfo.subresourceRange.aspectMask = VK_IMAGE_ASPECT_STENCIL_BIT;
+    }
+    
+    VkResult err = GR_VK_CALL(gpu->vkInterface(), CreateImageView(gpu->device(), &viewInfo,
+                                                                  nullptr, &imageView));
+    if (err) {
+        return nullptr;
+    }
+    
+    return new GrVkImageView(imageView);
+}
+
+void GrVkImageView::freeGPUData(const GrVkGpu* gpu) const {
+    GR_VK_CALL(gpu->vkInterface(), DestroyImageView(gpu->device(), fImageView, nullptr));
+}
+
+