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 0ebd1dd7fd1ffd29c0de71802d92a3d8e8e4162b..f27916f714bc55adcd4df801333a9bf1ebb74bb4 100644
--- a/src/gpu/vk/GrVkPipelineState.cpp
+++ b/src/gpu/vk/GrVkPipelineState.cpp
@@ -304,7 +304,7 @@ 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);