Vulkan: Enable anisotropy feature when available

If anisotropic filtering is used, the feature must be enabled at device
creation time.  This was missing.

Bug: angleproject:2901
Change-Id: I86db55f8b1696dc04eae922b941512f786aa12b8
Reviewed-on: https://chromium-review.googlesource.com/c/1479264
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@google.com>
diff --git a/src/libANGLE/renderer/vulkan/RendererVk.cpp b/src/libANGLE/renderer/vulkan/RendererVk.cpp
index d84b13e..4589451 100644
--- a/src/libANGLE/renderer/vulkan/RendererVk.cpp
+++ b/src/libANGLE/renderer/vulkan/RendererVk.cpp
@@ -931,6 +931,7 @@
     enabledFeatures.sType                        = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FEATURES_2;
     enabledFeatures.features.inheritedQueries    = mPhysicalDeviceFeatures.inheritedQueries;
     enabledFeatures.features.robustBufferAccess  = mPhysicalDeviceFeatures.robustBufferAccess;
+    enabledFeatures.features.samplerAnisotropy   = mPhysicalDeviceFeatures.samplerAnisotropy;
 
     VkPhysicalDeviceVertexAttributeDivisorFeaturesEXT divisorFeatures = {};
     divisorFeatures.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_VERTEX_ATTRIBUTE_DIVISOR_FEATURES_EXT;