Refactor Vulkan image, texture, RTs so that create and getter handles match.

src/gpu/vk/GrVkPipelineState.cpp

Index: src/gpu/vk/GrVkPipelineState.cpp
diff --git a/src/gpu/vk/GrVkPipelineState.cpp b/src/gpu/vk/GrVkPipelineState.cpp
index 8e52fb46c0e28282efc23ce688004ec3ed2df6e9..c3f91d04a70faae7d831b6bbedcbb54debd3c1eb 100644
--- a/src/gpu/vk/GrVkPipelineState.cpp
+++ b/src/gpu/vk/GrVkPipelineState.cpp
@@ -303,7 +303,7 @@ void GrVkPipelineState::writeSamplers(GrVkGpu* gpu,
         fSamplers.push(gpu->resourceProvider().findOrCreateCompatibleSampler(params,
                                                           texture->texturePriv().maxMipMapLevel()));
 
-        const GrVkImage::Resource* textureResource = texture->resource();
+        const GrVkResource* textureResource = texture->resource();
         textureResource->ref();
         fTextures.push(textureResource);