Enable tri-linear and NPOT-tiling support in Vulkan

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2004123002

Review-Url: https://codereview.chromium.org/2004123002
diff --git a/src/gpu/vk/GrVkSampler.cpp b/src/gpu/vk/GrVkSampler.cpp
index 904a8b7..87d569a 100644
--- a/src/gpu/vk/GrVkSampler.cpp
+++ b/src/gpu/vk/GrVkSampler.cpp
@@ -44,7 +44,7 @@
     createInfo.flags = 0;
     createInfo.magFilter = vkMagFilterModes[params.filterMode()];
     createInfo.minFilter = vkMinFilterModes[params.filterMode()];
-    createInfo.mipmapMode = VK_SAMPLER_MIPMAP_MODE_NEAREST;
+    createInfo.mipmapMode = VK_SAMPLER_MIPMAP_MODE_LINEAR;
     createInfo.addressModeU = tile_to_vk_sampler_address(params.getTileModeX());
     createInfo.addressModeV = tile_to_vk_sampler_address(params.getTileModeY());
     createInfo.addressModeW = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE; // Shouldn't matter