Fix vulkan ImageView swizzling to match spec

src/gpu/vk/GrVkImageView.cpp

Index: src/gpu/vk/GrVkImageView.cpp
diff --git a/src/gpu/vk/GrVkImageView.cpp b/src/gpu/vk/GrVkImageView.cpp
index d94aeeccb66076e5dc39e645c6332fdc17e508f2..b737df5f961902f132a1cbb1d6a6d1dec30de4cf 100644
--- a/src/gpu/vk/GrVkImageView.cpp
+++ b/src/gpu/vk/GrVkImageView.cpp
@@ -21,15 +21,13 @@ const GrVkImageView* GrVkImageView::Create(const GrVkGpu* gpu, VkImage image, Vk
         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_COMPONENT_SWIZZLE_IDENTITY,
+          VK_COMPONENT_SWIZZLE_IDENTITY,
+          VK_COMPONENT_SWIZZLE_IDENTITY,
+          VK_COMPONENT_SWIZZLE_IDENTITY },                      // components
         { VK_IMAGE_ASPECT_COLOR_BIT, 0, miplevels, 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;
     }